Support Mages And The Season 6 Meta
I'm a support main, and I've suddenly been losing lane a lot in the wake of the Season 6 changes. I think a big part of it is that support mages can't survive, because turrets have gotten so weak that they don't offer any safety anymore.
A support mage uses good positioning to survive. They have almost no defense, but they make up for it by anticipating enemies and not getting caught out. The turret nerf means that it's really easy to dive - or run past turrets - and get kills now, so their fallback pattern isn't viable anymore.
Anyway, that's why the only supports left are Blitzcrank, Thresh, Leona, and tanky Bard.