I guess I just don't see that abuse happening. I've only used it to dismiss people that are either AFK or Offline. On the rare occasion when you have a tank that refuses to actually even try to tank and doesn't listen to "hey, use flash? and enmity combo?" I've personally never used it for "abuse" and have never even seen someone else do vote dismiss inappropriately in any group I've been in.

The shameful thing about vote dismiss... apparently there is no penalty to those that are dismissed. I've kicked an AFK person out only to have them rejoin the group seconds later by using join party in progress.