Go Ahead and Keep Your Auto Fill System
I don't mind dodging and waiting to enjoy the game with the role I want to play. Sucks for the players who end up with me who land their roles because they might end up filled now, but that's on you, Riot.
I mean...you could always force players who dodge into filling on their next match, but then I'd just permanently uninstall the game altogether if that were to ever become a thing.
I won't be filled. I'd rather not play than be filled.