Duo Queues are already a serious problem in blocking surrender votes. Riot has already thought the issue of 'Vote to Kick' functions through, and decided they're stupid.
I mean, vote to kick is the sole reason why I did not buy Left 4 Dead 2. L4D one was fun, but I got votekicked within a minute of joining any online game, because I wasn't already an expert. After three nights of effort, I said "**** this", and downloaded League of Legends and got addicted to that instead.
I've spent several hundred on LoL since, and didn't by L4D2.
VoteKick is a bad idea. You're just pissing off your customers with that. A better community relations initiative is far simpler - ban more trolls. Better payoff, less collateral damage, more oversight by Riot.