A potentially optimal meta.

One with two tanks, Marksman, and a combination of a midlaner and another champion

Why this setup? Tanks synergize incredibly with other tanks, but don't have a lot of safe damage, and a marksman with their range and reliability can fill the void pretty well, both poking and being effective in teamfights.

Also tanks can be used in three roles, meaning that there will always be a gap in jungle mid and support, opening options up for defensive picks like enchanters, disruptors, and juggernauts and also offensive picks like divers, skirmishers, and juggernauts. (of course not picking marksman or tanks because that would be oversaturating one thing.)

The mid lane also remains open, so burst mages, battle mages, artillery mages, and assassins still find a place.

So rito, if you read this try to go for this. this is what Im pretty sure balanced league looks like.