While someone in Disney Corp most likely asked about turning DHS's ToT into MB, it was dead in the water because the two towers were built differently.
Also, while Spirit was whipping up the mob about MB coming to Orlando, WDW was removing items from the ToT as part of a plan to create the TipTop Club, doubling down on the TZ IP. They eventually decided not to go ahead with the lounge, but it shows that Spirit was dead wrong about how much Orlando was 'in danger.'
IOW, it wasn't Spirit nor the uproar from the fans that 'saved' Orlando's ToT. If Spirit and the fans actually had that kind of power, then Anaheim's tower would still be TZ-based. And it ain't.