For one thing, the tight clearances inside the tunnels and passageways the PeopleMover track passes through would never meet the criteria the DOSH inspectors now use for establishing a safe "ride envelope" for people who might stick their hands or arms outside of their vehicles. The sides of many of those PeopleMover tunnels are are load bearing exterior walls, and there's simply no way to rebuild them without demolishing many existing Tomorrowland structures. If an adult male can reach his arm out and touch something from a PeopleMover car, and there are plenty of places along the track where that is possible, then DOSH will never allow Disney to reopen the ride. Your tax dollars at work here folks.