Adding Que
I don't know if this would be a good idea but me and my friends were just discussing the idea, so it goes that if someone AFK that there can be a separate que that allows people to join games where someone has AFK'd and then they are given the role that they were in and they get all of the gold from the items that the AFK had (store price not selling). This could then allow for people to try and continue to have a good game.
To avoid complications the AFK would have to be away for 5 minutes and they have to have been present for at least 10 minutes (because otherwise you could just use the remake)
This should probably not be done for ranked because it could be risky and also the player filling in would have to be in round about the same level as the players who are in the present game and also like joining a normal game you select two roles and you can be put into either of those two roles. To entice people to do this it could be if you play 20 games of the "fill in que" you can get a cool skin (hex tech Annie for example)
Just thought this might be a cool idea