If it really is a maintenance issue, why not defer to the fall/winter season when the parks close much earlier anyway, rather than almost in the middle of the summer season?
Or purchase one, just one, additional monorail train and rotate others out of service each day for maintenance?
If it was a cost saving measure, certainly it costs more to operate multiple diesel buses, pay multiple drivers, and increase maintenance costs on multiple buses than it does an electric train with one driver?
Unless you really didn't increase transport capacity to replace that lost by closing the monorail?
Who knows what the real reason is. What's important is that Disney's response is stupid. Plain and simple stupid.
They lost $2400 from me when I switched my December reservation from the CR to the CSR, a decision spurred primarily by this monorail issue. If I'm going to pay a premium to stay at a monorail resort, then I expect the monorail to be operating as long as there are other significant things for me to do and get back and forth from.
So they didn't save a dime in that respect.