Sometimes people just stand, other times they purposely kill teammates (this has happened to me a few times), and sometime they're AFK (this happens a lot, actually). I've even seen guys purposely kill themselves the entire game. And then when you get the same jerk in more than one "random" game, it becomes a reoccurring annoyance.
Give a votekick option to team members and/or party leader.
Vote/Kick could just make it so a bunch of afk players join a party and end up kicking you for trying. It also, could make friends kick out people they dislike from the party for fun, and will be hard to manage while doing pvp.
So, my personal view I am sure the dev's will come up with a solution to this, but in the mean time we have to wait and see, but I am sure they will look over your suggestion and keep it in mind.