This is why I think they are holding off on the vote kick idea..
Think about this happening; 2 good irl friends are playing together in the matchmaking- but they happen to be real dicks.
They could potentially vote to kick the 3rd guy - seconds before the mission is completed.
Think of how pissed you would be?
If they add a vote to kick.. it should only be available up to the point of fighting the final boss.
Or on a 5 minute timer. To give you time to kick AFK peeps..