See I take issue with this. Over the past 10 years the trains have received total electrical wiring and system replacement, automation, exterior and interior refurbishment. I'm not saying that the current trains will last forever, but I disagree with your assertion that the trains are not holding up well. They really look really good now that there is active maintenance going on instead of a decade or more of neglect. Yes there have been problems, but I think the large portion of operational issues are as a result of the new automation system. The WDW monorail system is a very complicated integration of different systems, many of which were never designed to integrate with each other, further the system moves a lot of guests and gets abused severely by these guests daily.