Generally would agree... There needs to be a way to remove party members who are only there to get carried through an instance, or who just want to create trouble.

But on this note, I believe that kicking a player should not be allowed if they are in cutscene unless they are in the cutscene much longer than it should take. The main reason being that there are those who would instantly kick any player who wants to view the cutscenes because it is their first time and they actually care about the game story.