So, I watched a couple videos on jungle Vayne and jungle Kayle, and it looks like they might be able to completely replace a standard ADC. Here's what I'm thinking for a team composition:
Top: Bruiser or tank Mid: Mage Jungle: Vayne or Kayle Bot: Two tanks sharing CS (Maokai, Gnar, Nautilus, and Malphite would be a few of my choices)
What do you think? I know a lot of people don't like metabreaking, but I really think this could be viable.
LaowPing2 votesAzir ADC and Gnar support. Kayle is meta.
TehNACHO2 votessharing CS
EHHHHHH
You have to understand that the meta revolves around gold more than it necessarily revolves around champions. The reason why we have a Jungler and only one duo lane is so that you starve the least amount of players of their valuable gold. This is why the current meta is ADC and Support*. The ADC gets that lane's farm, and the support plays a champion that is safe from starving without sufficient gold.
Having a DPS Carry in your Jungle only means that you don't necessarily need another DPS Carry in the bot lane. This can allow for a Burst Mage/Assassin+Support bot lane, Fighter/Tank+Support Bot Lane, Utility/Burst ADC+Support bot lane, or a suicide run 1v2 lane with a roaming support.
The important thing is that, especially if you don't want to sacrifice your team's late game, you must have a support.
*This is only true for standard play. Watch the LCS long enough and you know why this isn't necessarily a true statement.
EDIT: Also, Jungle Vayne only works if the opponent refuses to Counter Jungle or something
BlueBanthaMilk1 votesA more viable off-meta comp might involve, say...
AP Mage in Mid AD Tank/light damage top (Gnar, etc.) AP Tank/CC machine (Cho, etc.) AD Sated JG (Vayne, Yi) AP Tanky JG (Gragas, Sej, etc.)
It's the same principle, though with the addition of more XP at the cost of being pressured more early game. In the jungle, players would farm independently until a point where they had enough vision to raid enemy jungle on the side the enemy jgler isn't at, while the other roams. Midgame, they would simply roam together and duo gank lanes. With enough tanky, damage type spray, and CC, it's theoretically possible.
ElJanitorFrank1 votesI dunno about jungle Vayne and Kayle. I understand the principle of kiting and leashing and what-not, but they are extremely viable to get invaded early on. ESPECIALLY VAYNE.
The reason Vayne is doing so well is because most of the early game ADCs have been nerfed recently or aren't as viable as they once were. There are PLENTY of junglers who shine in the early game and will easily destroy a Vayne or a Kayle. Especially with Elise on the rise.
GamerThink1 votesTry 
+ 
/ 
duo lane :D
You should try go for duo jungler with one of the bots to help out the squishy one
Troll for Trump1 votesJungle kayle has been a thing since forever kappa
