I'm somewhat mixed on the prop debate. On one hand, I don't think SS44 is the place for it, nor do I think they are rushing to rip out the old building to build such a thing. However, I do think there should be a place for it in the park.
The Boneyard used to be that area for Universal Studios, but of course that was replaced by the concert plaza and HRRR. Someone mentioned Lucy's building and I think that could be replaced to properly display upcoming and classic movie & TV props giving guests the opportunity to get an up-close and personal look at some of their favorite films as well as films they are looking forward to.
The only issue, which has been mentioned countless times, is draw and whether or not such a thing could be one. At this point in time, I don't see Lucy as much of a crowd gatherer. It's very limited in its audience and even then, it's a little past its prime. However, I think if Universal combined props from both classic and upcoming films & shows (maybe even including some of the Lucy memorabilia for the "classic" side of things), they could draw a larger audience of all ages to the building as well as illustrating the "studio" part of the park without losing an attraction. :shrug: