Make support great again!
With the mid season update all but complete, I believe it's time for Riot to focus their attention next on the support role. Currently it is, by popular consensus, the least fun role. While alot of support mains would disagree (bless your souls, we love what you people do!), overall improvements need to be made. Queue times are out of control if you queue for a non-support role, to me that represents a major issue to game health.