You think that's any different than it is now? Because it's not. And if you think literally no one will queue to help new players out then you are wrong. There will always be people out there willing to help people get through a dungeon if they ask for help, happens all the time in Novice Network. Besides, everyone knows the hype and complaints are overdone before a new patch so watch and see, it won't be nearly as bad as you think it will be.
Not that much longer than it already does, actually.
Castrum Meridianum and Praetorium are basically the only instances in the game where you pretty much walk through a theater. In the case of cutscenes elsewhere it's mainly boss entrances and cutscenes before an instance commences, in which you're locked in a circle of light anyway.