Riot has plans to get rid of the support role and replace it with something better

Okay they don't, but I think they should

So how about you have 3 solo lanes, 1 jungler...and one Controller.

The controller can take a summoner spell that is required for certain control items. These items can allow the controller to do things like:

Increase a turrets defense, or repair a turret or temporarily enhance its damage.

The controller can also, from time to time, increase a wave by 1 or 2 minions at the cost of 1 or 2 minions from another lane next wave.

Controller can place 2 control wards instead of 1, and other wards last 1 minute longer.

Controller can scrap a turret for parts based on how much health the turret has, and use parts to enhance other turrets or reinforce structures.

I think something along these lines (don't fucking knit pick the specific ideas i laid out, they are just examples) would get rid of the angst of support and allow all 5 players to have a solo role, but yet would increase the depth of strategy and complexity.