On the boards, there are a lot of full on Great Movie Ride advocates so there isn't the positive hype that something new would be given. Couple that with the fact that all construction is being done inside, at apparent top secret status, out of the eyes of the public have been the reasons for lack of excitement, at this point. As a person that went to DHS since it opened as Disney MGM, I too am more excited about this one then Galaxy by huge amounts. And I loved the GMR.
That attraction was suffering from Congenital Heart Failure ever since the soul was destroyed in the killing of the working studio. It just hung on because there was not a whole lot of anything else. They tried a heart transplant when they managed to get a new sponsorship by Turner. The operation was not a success. Hiding it behind that Big Ugly Hat since 2000, didn't contribute to it maintaining a long life either. The last decade of operation the GMR was operating at half capacity every single time I went to it. Only one train operating. It didn't help that the vast majority of visitors to DHS were there to ride the Tower of Terror and RnRC. People that love thrill rides are usually not all that interested in a slow ride through story sets. Sad, that it no longer was an attraction that today's audience wanted to see anymore, but, everything has a life cycle.