Last I recall, weren't the skins from the Trikes removed, leaving exposed mechanics which would likely get somewhat damaged over time? Who knows what condition these animatronics are in... while I'd love to see this attraction make a comeback as it was a very nice, intimate experience, I think it's doomed to be shuttered for a good while yet. The cleanup in the queue is a bit of a mystery, but my guess it's either 1) upkeep for safety/show's sake and/or 2) making room for some extra miscellaneous Potter storage.