Towers
I don't want to sound like that guy that trash talks about turrets being weak, however can't towers get stronger the closer to the nexus it is? First tier tower stays as it is, and the closer it gets to the nexus they gain bonuses stats or maybe even abilities like triple shot or something. The nexus turrets would be strong enough that the enemy team would have to at least take two inhibitors before ending the game. This would make games last longer and become less snowball. I'm certain I miss some sort of detail that would make this sound ideal but you should get the point. Thoughts anyone?