Possibly, or give them a chance to do shows on each one. Plus, I don't have much of a connection to BTMRR, yet apparently there is a backstory. This could add to, and maybe rekindle, an appreciation for legacy rides/lands.Yes, but this may lead to more homogenization across the parks globally.
For example, if the Haunted Mansion becomes a popular part within this MKU, then there will be pressure to replace Phantom Manor / Mystic Manor with Haunted Mansion material. The original Tower of Terror might become revised to be another one of Harrison Hightower's hotels.