All you garbage little kids
ARURF is called All Random Ultra Rapid Fire for A REASON. If you can't handle getting a champion you don't want, either don't friken play the damn gamemode or grow a f+cking pair. Sick and tired of all these little babies who can't handle a damn champion. Takes 4-5 queues to finally get in the ruddy game and even then, if someone starts losing even a little, they whine and b+tch about it all game and/or AFK. It's a gamemode created for us to have FUN. Don't start going all tryhard over URF of all things. Seriously.
And so I'd like to propose that whatever champion you receive in game is what you get. Doesn't matter if you leave the champion select, you will no matter what get that champion on your next game. Easiest fix I can think of.