I was literally about to post a topic about this very idea, i hate going into a game with some friends, ether someone argues over a position, or someone is forced to play a role their not comfortable with. I 100% think they should implement some sort of idea like this, but one thing I've been wondering...
would the game be as fun if you didn't fight over what you wanted to play?
Like, if you got to play the role you wanted all the time, would you keep enjoying the game? isn't forcing you to play different roles what keeps the game fresh?
and on a second note, if we didn't complain about how the games are set up, what would we complain about next? would we complain more about champion balance? elo hell? the graphic style?
Yea i hate the way i have to fight for the role i want to play, yea i hate being forced to play roles that end up making me throw a game, but in the end, that chance makes me appreciate when i get to play the roles i want.