Test track too? Wow.
In the interest of conversation, could you give us a few examples of a situation where the attraction Disney installed was as good, or better than the one that preceded it?
Hmm ... as good? I think all of these are at least arguable ... Soarin', Star Tours 2.0, Captain EO (both times), Dreamflight, Buzz Lightyear, Alien Encounter, Country Bears Vacation Hoedown, Philharmagic, Legend of the Lion King.
This, of course, doesn't even begin to discuss the many great attractions that were built without removing something else ... Tower of Terror, Rock N Rollercoaster, Horizons, Living Seas, Cranium Command, Body Wars, Maelstrom, Fantasmic, Expedition Everest, etc.