Hey Riot, Some Advice From Someone That Has Been Around Since Beta
The whole "I don't want to support, can I jungle/adc/mid/top" crap has existed since the start of the game. Because of the lack of people that want to play the support position, many people are autofilled into said role and forced into something that is as you would call "antifun" for the good of the team. Many champions have been reworked over the course of this games history because they reduced the overall experience of those playing. I believe the support role needs an overhaul for the same reason, and autofilling people into said role isn't the way to go about it.
Why doesn't the average player not desire the role of support? I believe the answer to that is people agree that they can't carry a game the way a successful top/mid/jungle/marksman can. They don't get the glory of having some eye-popping number of kills. The #1 reason people don't find support to be fun is that its the hardest role to carry a game with. The perfect game as a support isn't nearly as fun to the average player as snowballing and slaughtering teams as a top/mid/jungle/adc. How do you change that?
Well, in DotA 2, without going into great detail, supports actually tend to have some of the strongest abilities in the game to boot but don't scale into late game. They use this advantage to roam the map and provide vision/ganks for their teams/lanes and protection for their hard carries. Supports have the absolute largest impact on the first half of every single game due to their map prescence and power at early levels before the core position players get items.
That said, I'd love to have supports in this game to FEEL like they are having a large impact like they do in DotA. A way to do that would be to make roaming less risk/reward for supports. You give up so much in terms of gold, protection, and experience by roaming in this game as a support if you fail to successfully gank. Allowing them to place more pressure on the map early on without so much risk would be awesome.
TL;DR: I believe that more players would love to play what is now the least-desirable role in the game, support, if it had a more rewarding impact on the game. I think the best way to do this would be to make roaming more effective and an option for supports in the early stages of games.