Epcot is the awkward one I guess, because of you've exited out of International Gateway and only then find out that the Skyliner queue has closed, or that it's still open but they won't let you on because your destination involves a transfer at a station that will be closed by the time you get there or the other line is down, you've got to walk back a mile through Epcot to the buses. I can only imagine another way out of this is to lay on a special bus service from CBR to Pop/AoA? It's also a more general problem - suppose Skyliner is down and is not going to come back up, how do you know that before heading out towards International Gateway?