5 Tank Strategy

So, I am just going to say at the beginning that there are many issues with the strategy I am about to lay out. But keep in mind that it is just an idea to win a single 5 man game, and not something I think could become a viable long term winning strategy, especially the higher elo you go. But the strategy is to play just 5 very tanky players with demolish. Something like a

Top- Jungle- Mid- ADC- Sup-

With a whole lot of people you could sub into these roles based on enemy team comp, or just your personal preference and skill level. Such as a probably deserves to be in any game like this and could all be included depending on team comps. You would have to ban a few champions such as and then just another couple champs who could really do a lot of damage in a long team fight like . But the overall goal of the strategy is just to survive the first 25 minutes of the game until all these tanks become tanky and then they can win long team fights even with relatively little damage. An Amumu ult followed by a Galio ult still does quite a bit of damage, and the longer the fight goes, the more it favors the unstoppable tanks. Split pushing is an ease with many demolishes and enough health to survive if the enemy tries to stop you. And well, if you take rift, that is a free inhib if the whole team groups with demolish.

I have played 6 games of this and gone 4-2. Both losses came when one lane fed so hard early that the enemy team was able to end before our tanks became unstoppable. However, knowing that, it isnt too hard to avoid feeding if your entire strategy revolves around just staying alive for as long as possible to prolong the game.

I am just wondering if anyone has any thoughts, either on improvements to this strategy, or ways to counter it (a few friends and I already thought of a few, but I'm wondering if anyone else thinks of them).