This argument can go both ways.

Yes it's wrong to kick them without telling them they're holding up the team, but at the same time new players got to be alert that not everyone will have the patience to wait on them to watch the full CS video. I caught on to this quick when I did my first primal fight as a low level. It sucks I can't watch the whole thing, but I don't want to waste other peoples time because they probably have plans such as myself to do in reality. I can always recap what I did not watch at the inn.

It would be better if the CS had a shorter duration like 15-30 secs and none can skip it. Leave the long CS for solo content and short ones for group content such as dungeons and raids.