In the case of the Epcot loop, however, there is not a redundant beam and therefore you are either completely shut down or need to run a "shuttle" back and forth on the same beam. Given that the Epcot loop runs with 3 trainsets, your throughput is at best 1/3.
If there are three trains on the Epcot beam, and one of them is disabled, you can run in 'shuttle' mode with both of the remaining trains, not just one.
In the case of the MK loops yes - there is a redundant path. And the Express loop I believe CAN be used for resort stops in an emergency. But your throughput is cut completely in half.
The Grand Floridian and Polynesian access to the Express beam is on the wrong side of the station platform (Contemporary doesn't matter, in fact I've boarded the express beam from here). I believe there are stairs leading down from these otherwsie unused platforms, but is there any provision for bridge plates or something similar to permit direct access from a monorail on the 'wrong' beam? Anyone know?
The big advantage of regular rail is that switching between tracks is relatively easy and comparatively cheap - however, all sorts of blocking and signaling needs to take place - it may require manual protection and blocking, which severely limits throughout. On an occasional commuter or inter-city route its not a big deal.
I'm not sure what you're trying to say here, but switching from one track to another is routine (tens of thousands of times a day...) and no "sorts of blocking and signaling" is required. Nor does it (ordinarily) cause delay. Even if its a hand thrown switch somewhere (most are controlled by a dispatcher, often hundreds of miles distant) its still a simple matter of throwing the switch, pulling the train through, and then realigning the turnout.
I've linked an old post from Chip N Dale Express. He does a good job describing reasons why a monorail expansion won't be an improvement.
He knowledgeable about the Disney bus system, and probably a champion of bus transportation in general. Which is fine. Buses will always be an important part of the WDW transportation picture, and I like the efficiency of bus transportation also. That said, Chip N Dale Express makes assumptions about how an expanded monorail would work at WDW which make it appear that buses are the better solution and that make monrail look bad in comparison. A fixed-guideway is not a problem - Its the railways greatest asset!
Finally, if the monorail ever were to be expanded (again, its
not going to happen folks!) -
why, why, why would you design it so guests have to transfer to reach their destination!. I don't know why people keep making that assumption; A monorail can offer a 'one-seat ride' from resort to theme park just as readily as a bus. Just because it isn't done from Epcot to the Magic Kingdom is no basis to declare that monorails require transfers. Indeed, regarding this example, remember that buses didn't used to go directly to the MK either - the gateway to the park was the TTC, and
everyone took the ferryboat or another monorail over.