New Suggestion for Tanks
So S5 we have this new concept of summoner spells interacting with items. Why not make a new summoner spell for tanks that IS A PASSIVE and scales ARMOR and MR. So say the armor scaling is .2, with 100 armor you would actually have 120. Also, make a new item that has a tanky active or passive that only works for players with this summoner.
Obviously, numbers would need to be decided carefully to avoid abuse of this. Maybe it could scale with level so tanks would be more useful late game.