Hey RIOT. YOu want people to play Support? THEN BUFF THEM!
Honestly, the worst thing you ever did to supports was the scaling utility, whoever had that idea doesnt deserve a place on the design team AT ALL!
You wanted to change SUPPORT CHAMPION, the ones that BARELY GET ANY GOLD, and what was your idea? "Hey, lets make their UTILITY, the thing that is supposed to be their best part, scale of AP, a stat which any good support BARELY BUYS!"
And then you wondered why they went mid, became strong there and you nerfed the hell out of most of them.
I mean, for fucks sake, look at the top 5 support champions right now, only 2 of them are actually support (Janna and Soraka), the other 3 are either mages (Zyra, Brand) or Tank (Sion). Why? Because mages and tanks can do the job better than supports!
You want people to play support and enjoy it? Then freaking buff the role so a Support can have an impact on the game.
First of, remove that stupid scaling utility from Champions like Nami or Janna, that was a fail move and we all know it!
Second: Change how they work. Dont give them any AP ratios AT ALL dont make them scale with Items except for Mana and HP, but therefore give them great base stats and tons of controle potential. Basically the goal should be: The Champion could deal 0 damage at all and still be usefull in teamfights. The removal of AP ratios would make it impossible to just take them mid and abuse them with gold, and at the same time, remove the problem with Support gold gain.
Next, make the Crowd Controle on Support champions be better. Thats what a support should do, controle the enemy team, offer ways to engage, disengage, protection (Janna should be your Champion to take as a "how to make a good support", since she can actually do this stuff, which is the reason why she is one of the only 2 supports in the top 5)
Then give us more Support Items. Items that dont give enough Stats to be justified to be bought on anyone but the support, but therefore they have great active effects that can change the game. These Items should be cheap but in no way slot efficient (so that even the effects dont make them worth buying for laners.)
Make supports more than just "well, we have 5 players, but only 4 ways of income, so one of you only gets to play half a game of LoL now".