So there is a proposal to bring HMH to Magic Kingdom eventually?
Tokyo Disneyland does a fabulous job with their version of Haunted Mansion Holiday. And since the Tokyo Mansion is a nearly exact copy of the WDW version of the attraction, a WDW copy could be made easily.
I sometimes wonder if the Tokyo Haunted Mansion Holiday sets/equipment weren't originally meant for WDW and Tokyo scooped it up in 2004 and paid the bill instead?
The Disneyland Haunted Mansion has a different ride path and scene layout than WDW's, so a direct copy of Disneyland's 2001 Haunted Mansion Holiday sets/equipment wouldn't work or fit in all the WDW scenes. But a copy of Tokyo's version would slot in quite easily I imagine.
Even after a decade it's still wildly popular at Disneyland, and when I've been in Tokyo in October the HMH ride is jam packed there as well.