Wait for those dungeons to be dead again. Noones gonna run a dungeon with 30+ mins cutscenes attached to it.
Personally, I don't mind having newbies watch them, I even join premade unsync groups sometimes to let new players watch, but I'm in the minority of doing that.
What Yoshi says sounds strongly like unskipable cutscenes and if they do that, I'm 99% sure those dungeons will remain empty.
