...and it's not hard to see how this is going to be a game breaker.

25 minutes trapped in a location where there is nothing to do and I am the only person in my party.

And this is not that far out from release. In six months, a years' time this is going to be a near impossibility for new players/characters.

Making a mandatory dungeon for the story quest is an insane idea, especially one where you are stuck in an area with nothing else to do.

Square, fix up.