I don't see how this is disappointing at all. It's kind of the best case scenario. Muppet-Vision is a show far greater than the projected video alone. It was a multi-media 360 experience with the animatronics, live performer, fog, water, and bubble effects, etc.
There really isn't a more perfect way to preserve a medium like theme parks than VR. It's certainly an inaccessible medium to many, but ... there already exist high-quality video recordings of the projected video itself if you want a more accessible, less complete version.