Just make Enchanters worth it again so they can actually defend people with their abilities instead of just being walking double kill for the assassins/divers when trying to defend the ADC. And fix all the mages that the mage update screwed up and they'll be able to survive in mid lane again.
But until then, I'm going to play what I need to play in order to win my games. If that means that my teamcomp of Fiora, Rengar, Talon, Vayne, and Brand isn't fun, I can't help that, but I need to be the AP, AOE, and waveclear my team needs since none of them thought those were important qualities. Would've picked Zyra for easier CC, but since the enemy has an Irelia and my plants become just a free gapcloser for her, I'll just hope my AOE damage makes up for our lack of CC since no one else on my team thought that was an important thing to have vs that Yi pick.
Literally, there are so many games I've had where teammates ignore obvious team comp issues and just pick whatever they want to play and I'm stuck trying to cover 14 different things from the support position. At least having a viable mage support helps for those instances. Granted, I would rather not be the APC of our team when I'm 3 levels down and 4K gold behind the enemy APC, but that's the hand I'm dealt so I work with it. If mages were more fun to play mid, maybe more mid laners would choose them.