This needs to be stopped, and immediately.

[Grizzlebeard]

Nothing forces the other 7 people to wait.you can continue without those watching the cutscenes THAT is also a choice you have, of course you live with the consequences......ahh how silly of me, why would people be accountable for their decision. Equally the one watching the cutscenes, bears the consequences as to skip some fights, a relative good compromise.

Mei

You aren't contributing to the clearing of the instance if you're afk watching cutscenes. One or two people do that you're directly hampering the other player's progression through the zone and depending on your class that could classify as harassment. So, yeah, you'd most likely be kicked in most parties I've seen in Story Roulette.