I know it's a matter of team comp/what's needed. But in some games (thinking smite) the tank is usually the support. In league I prefer if the jungler is a tank. Some people might want the top laner to be a tank, but I'd prefer a fighter up there like an Irelia. I myself (a support main) prefer to play huge utility supports like Janna, Lulu, Sona, Nami. But I can whip out Leona every now and then if we need that beef. Who would you like to be the tank.
ItsCalledALance2 votesoh oh ! pick me!! sampai I know this!!
THE GUY WITH THE MOST HEALTH!!
do i win?
Truly Prideful1 votesWhy not all 3!?
I think I like the tank in top the best, a farmed tank is nice to have. I usually like teams best when we have a tank and an offtank though. Too many squishies ends in disaster a lot of the time.
cuddlykitten41 votesTANK IS MID! GET IT TOGETHER MAN!
Yumifries1 votesIt's really just dependent on what people like to play in your team. I like to play support, but am horrible with tanks, usually sticking with Janna and Sona; So I prefer top lane to be the tank or maybe an amumu jungle.
ValyrianBlade1 votesLacking options. All 3 is always the right answer!
I mean seriously, if your team is ahead your ADC and APC do enough damage that you want the extra tanks to peel and keep them safe.
If your team is behind, the utility offered via the tanks CC means that more of your team is still useful, and your damage dealers will survive longer thanks to the peel meaning that you can kill the enemy team's damage still. You can lock down under turrets and stall long enough to keep up.
At least outside of incredibly high elo, the team with more tanks is the better team. I can't even count the number of times I've been on a team with a 0 or 1 tanks and mostly fighters/assassins and we've gotten ahead but ended up losing. I can't remember the last time I've gotten ahead in a game where I have 2+ tanks on my team and we've lost.
On a more to-the-point note: I think top should be a fighter/bruiser with some CC but still damage potential. Tanks just don't have much influence in the early game. They can't punish roams because they can't push and damage the tower well. They can't roam themselves very well because they often lack mobility. They can't get ahead in their own lane. Someone like, as you mentioned Irelia, can do a lot more in lane while still offering peel in teamfights (and an extra source of damage if a damage dealer got caught). So both the jungler and support as tanks would be preferential in my opinion.
Peel wins games.
Azteryz1 votesput a all three option
At Least I Ward1 votes
top
mid
jungle
support
Anyone misses mid season 5?
aw yiis
EndlessSorcerer1 votesYou forgot 
or 
ADC
I did love the Cinderhulk meta though, even if it ultimately got Gragas and Sejuani nerfed.
At Least I Ward1 votesYou forgot
I did love the Cinderhulk meta though, even if it ultimately got Gragas and Sejuani nerfed.
i think back then urgot was actally picked mid
Ralanr1 votesPersonally, I think all lanes should have some tank options (mid and ADC have the least. Mid has 
and arguably 
and 
. ADC has...).
I like to play tanks. You could call me a tank main (but I'm also an unranked scrub, so my opinion won't be taken seriously). And nothing annoys me more than being put in positions where I can't build my preferred playstyle.
But everyone likes mid! How can you be annoyed to play it?
In mid I play champions like 
or 
(Blitz is for when I'm REALLY FEELING IT) and I honestly don't like the position that much since the lane seems hellbent on snowballng. I don't want to snowball, I don't want the entire game centered around how quickly I can kill my enemy (because despite this being a tower defense, it's played like team deathmatch). I have to rely on other people to keep people steady and despite being a tank main, I have problems trusting people to do the job. That's probably why I play tanks, so at least someone on the team can focus on locking people down as everyone goes crazy for kills (Even the supports. Like poke supports).
A tank ADC would be toxic
Nobody probably thinks this, but I wanted to shed light on this concept. Yes, a tank ADC would be bad. ADC are suppose to build nothing but damage and push towers. Tanks are suppose to be very survivable in combat. Fusing these together gives us juggernauts, who are weak by their range. A ranged juggernaut would be a horrible thing.
But then we have the abomination in the room: (referring to his character, though his kit has problems). will probably need a rework (I'm betting after Yorick) to fix his problems, but how can we approach this guy? If they made a Marksman/Tank...well I don't know how they'll do that but I guess we'll see it.
Now for the lanes you've mentioned I'll give my personal opinion.
Top: This has always been weird for me. Toplane is suppose to be that solo lane where you basically split push (I'm probably wrong, but there was that whole "Top lane is an island" thing). Tanks such as 
and (He was a top laner originally I think) are team focused champions. So why should they go into a lane that is mainly solo and not as important as Mid?
Jungle: This is where I prefer to play tanks. Tanks are not early game, they are mid to late game champions. The jungle allows for tanks to provide utility to their teams without too much danger of dying a lot early (Which is my grip with support tanks. I'll get to this). Problem with the jungle is that it doesn't provide much gold and tank items can get pretty expensive.
Support: I don't like to support sometimes. I like playing and support (and 
but I suck at her) but I'm prone to dying a lot (sometimes to protect my carry, sometimes because 
support decided to focus me) and thus I can't get many items to be tanky. There's also the problem that I have to give my carry kills (because they need them and are whiney when they don't get them sometimes) and sometimes I just don't want to risk the enemy living. So I'm gold starved, tend to die a lot, and can't do much unless my Carry is ready or the enemy dives. I also can't play my favorite tanks in support (no one trusts support) which is annoying.
As for which of these lanes should hold the tank? Any lane can have a tank, just as long as you have a tank on your team. I'm probably biased, but teams with tanks seem to win more than teams without tanks. You need people dedicated to holding others down for you to kill them. Problem is that tanks don't really get rewarded. Assists are the "support" scoreboard, so many top lane or jungle tanks may feel under appreciated in their endeavors. Thus tanks get played less and replaced by TANKY bruisers, who can fulfill the role decently enough while provided enough damage to carry.
I like tanks. I believe that no lane should be deemed the "tank" lane and I think this for all roles (but the meta has already shoved supports in bot sadly). If your team doesn't have a tank and you think it's needed, play a tank (Course if you are mid or ADC, you are kinda fucked for options).