Stop Punishing Fill Players
Currently selecting fill even as a secondary role condemns one to being the support. I have nothing about supporting occasionally or even frequently, but when I get told to play the same role over and over I am less likely to fill and thus will decrease the number of supports in the pool.
I suggest that instead of having a fill role a "random" role is implemented that is perhaps skewed towards support but would stop punishing players who, rather than being support mains, just want to play different roles away from the toxic mess that is blind pick. If the number of supports drop it would be no issue at all to "auto-fill" more often than is true now and simply punish queue dodgers with 20 support games in a row.