Get Rid of Autofill
I'm well aware of beating a dead horse. But here I go.
LET SPOILED CHILDREN WHO WON'T SUPPORT WAIT TEN MINUTES FOR A GAME. LET THEM WAIT TWENTY.
I swear to god, autofill has created the most toxic support meta I've ever seen in all my years of league. No one actually supports. Half the "supports" you get actually don't even ward and just start doran's ring, which is toxic as shit because the team is depending on supports to do a large portion of warding (and what am I gonna do, buy a spellthief on an adc? really?).
So just stop the nonsense and let people wait forever if they won't take a legitimate turn at supporting. Seems only fair.