The main problem with the WEDway system is that it was based upon linear induction motors (LIM). While LIM is great for certain applications, it is not a good system for a slow people moving system. The system was designed back in the 1960's when nuclear power plants were coming online in rapid succession. The promise of cheap and never ending electrical power was thought to be imminent. The Disney designers of the WEDway didn't care that their system was grossly inefficient and used much more power than a conventional rotary electric motor. It is under powered in the sense that a conventional rotary motor could supply much more power for far less cost.
Disneyland closed their system in 1995 citing expensive costs as the reason for the closure. The airport in Houston has publicly stated that the cost of maintaining and operating their system is not a viable option. They currently have new systems under study.