Easy, a power failure on a train shuts down the entire line.
Requiring ...... wait for it ...... Buses as a backup.
Inflexibility of trains is a flaw inherent in the system. The tracks are nailed to the ground.
A failure for any reason of one train on a line doesn't take the entire line out of service. In a fully implemented monorail network, with a few strategically placed switches you merely run around the stalled train. Even on the Epcot beam as it exists today, if one monorail becomes disabled the other three trains on the line can run in shuttle mode between the TTC and Epcot stations until the work tractor can get there. A power failure on the entire beam would shut it down, but the solution to that is redundancy in the system, something WDW doesn't really have today, but which would be a natural consequence of an expanded monorail system.
Buses will always properly be a part of the WDW transportation picture, just as they were prior to the Epcot monorail expansion, and available to backup the monorial, ferryboats, or whatever. But the whole potentially disabled monorail argument is mistaken; Railroads solved these very problems something like 150 years ago, and it literally isn't rocket science.
Oh, and railroad tracks aren't nailed to the ground.
Ok I didn't want to pull out the math but you made me.
If you connect every hotel, park and other areas of WDW with direct connections the amount of of lines would be ....
(n*(n-1))/2 where n=the number of places that need connected. Had to ask sons what the formula would be.
So lets say if certain resort areas could share we could maybe come up with 10 areas???? So that makes 45 direct lines at maybe an average of 4 miles per line makes 180 miles of monorail track. At $10m per miles comes to 1.8 b.
Oh and the station at the MK would spill out into the lake.
Uh...
What???
When you connect any of Disney's existing resorts to the theme parks, do you build a different road for each resort? Of course not, they all use World Drive.
The three current monorail connected resorts, to the MK, also do not each have a separate monorail line - they share a loop, of course. So,
why would you assume that additional monorail resorts - to provide direct theme park access - would each need a private monorail beam?
Think of the TTC-Epcot beam as the mainline, probably extended to the Studios and then to Animal Kingdom. You build branches to other destinations (Blizzard Beach), sidings for resort stations, etc. (or monorails may passs through resorts without stopping - express theme park service). Again, this isn't rocket science, and its not that difficult!
The best: Disney could make a hit movie and use the proceeds to pay for the expansion. It the old movie plot, a bunch of kids siting around trying to come with ways to save fill in the blank. One of them stands up and says "I know lets put on a show".
If Disney would only stop utterly wasting money on brilliant business moves like Go.com, airplane leases for bankrupt airlines, overpaying for the Fox Family Chanel, and the like, you would have enough money to pay for a monorail expansion of your dreams - and maybe a fifth theme park to go with it.
Again, despite everything we say here, its not going to happen anyway. Disney can certainly afford it, even at inflated cost estimates, but buses are cheaper. There is no will at Disney to do anything like this, and few people who appear to be able to see past this quarters financial numbers. The show and guest experience aren't what matters anymore.