If the CSs were unskippable no endgame people would bother running it at all, and new people would have to wait an ungodly amount of time for the queue to fill.

It does suck for new people not getting to watch the CSs, but it sucks for the 7 people if they forced to sit through them too. Unfortunately it's a no win situation, basically because of how the dungeon is designed... they shouldn't have put such lengthy CSs mid-dungeon (and thankfully haven't done this with anything subsequently)