If Dungeons are going, nothing of value was lost.
All serious though, if it was built alongside the hotels as park of the resort experience rather than on the park then it might have worked better.
Given its am indoor attraction on the cards, I hope a return of Black Hole in a vastly updated form is here as would be Port Discovery replacing TWODW would be here!
Also, if this is being planned alongside Duel's refurb, wonder if Merlin/Towers have put forward a dark ride team for the park with Duel's refurbishment being a test bed for this team to start from in which once they have the experience from learning from it then they can tackle a bigger challenge which is the Dungeons building?