If Riot nerfs jungle and support, I think the game will be fairly balanced.
Because as of right now, most games are decided by the jungler ganking bot lane as much as possible. If the bot lane wins, the support gets massive amounts of gold and protects the otherwise vulnerable ADC with stupidly cheap items. Then, the ADC never dies and steamrolls over everyone.
If Riot nerfs jungle, this constant stream of ganking bot lane won't be possible anymore. Then the snowball from support won't be possible. Then bruisers not named Camille can actually do something in fights, instead of getting peeled off.