I get where you're coming from, but I always want the parks to be adding new creations. It keeps the industry fresh and employed, we get something new, and a new generation gets to work on a loved property. If something BTTF is coming I'd like something new because at the least we get to see a new group of folks take on the concept.
Agreed, now one can make a pretty good case that BTTF still has enough relevancy to keep making new things with it. And I think a fantastic example is the backlot experience at Hollywood's Fan Fest, that was really cool and very well received. I would love to see Universal keep making cool new stuff like that, that's how you keep moving forward with a beloved IP.
And that's a factor why I don't want them bringing back the ride, that's not moving forward, that's being stuck in the past. As nice as the ride was, it had it's time and it's best to move on, especially for the ride system's sake.
I don't want them to destroy two highly expensive OMNIMAX dome screens. We already have few legit IMAX theaters around as it is. Update the ride mechanics, update the projectors, no need to demolish the building.
Gonna' be honest here, not wanting something to be torn down because it was expensive doesn't hold water. There was actually an example of this not too long ago, as some folks theorized that Disney wouldn't tear down the ill-fated Harmonious because it was so expensive...yet that is exactly what Disney did, and that was something that was brand new.
The bones of this attraction have been around since 1991, and it's being held together by duct tape, a lick and a prayer. While one might think you just need to replace the ride system and projectors, I don't think that's gonna' be cheap, especially with the ride system.
Also, there's no guarantee that's all they need to do, because what is the state of the building itself? Disney has paid the very expensive price on trying to reuse old buildings (Hi, Cosmic Rewind.), so one better hope they don't find any issues that require more refurbishment.
This is not like Disney swapping films/ride programs for Soarin'. Universal would have to put down a decent amount of money just to bring back a past attraction, and is that what the Studios need going forward? Personally, I feel a potential Hill Valley with a brand-new attraction as it's anchor is gonna' be a far easier sell then a Hill Valley with a past attraction as it's anchor.