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A critical issue with the Disneyland PeopleMover was that every hundred feet or so, they had rubber tires embedded in the track to propel the vehicles, which were nightmares to maintain due to how many there were. Not surprisingly, this system has been out of commission for decades. They sort of solved the problem with the Florida version, which still operates, by replacing the rubber tires with linear induction motors, but the one disadvantage is that the track has to be perfectly level. Not a problem in Florida, but pretty much anywhere else that could be a problem.
Related note, one other Disney PeopleMover operates and is located in non-Disney-owned property: the subway in Houston's George Bush Intercontinental Airport. The system is aging and there are plans to replace it entirely with something else, though.
In a nutshell, if Disney PeopleMovers were any good, there would be a lot more of them, and there are only two operating, which is going to be cut to one in the near future. Other types of automated peoplemovers, however, are great transport options, such as the Crystal Movers made by Misubishi (pic related).
