No! (specify why)
Very simple idea to limit how much damage a non-conceder can do:
Void his voting ability after 5 negative or unanswered votes in a row, if the rest of the team generally said yes.
If it's lost and he simply won't concede, because he just says "come on, feed them", then there's something wrong. If he doesn't answer, then he is technically away from the keyboard, or doesn't care about the votes outcome.
no cause conceding is for pussies.
anyways remove concede option and reenable kick. that will make everyone man up cause they care for their holy leave stats and that will probably make them play better other than lulz i suck i concede at 15 minutes cause the game is totally over at 15 minutes.