Meh, I don't get all the fuss about the risk of the skyliner being down. Yes, it happened when we went last august. Mornings were usually totally fine on the skyliner--it wasn't until 2pm or so that you ran the risk of shutdowns. Yes it is annoying when the skyliner goes down but that just restores to the default that exists for any non-skyliner resort: take a bus if the line at the bus stop is reasonable, take an uber if it isn't. That's what we had to do for all four parks when we stayed at OKW on our last trip--and frankly, most of the time it was uber because buses were such a disaster at that resort. At least when we stayed last august at Riviera, we got the skyliner at least once a day as an alternative to buses.
*edited to add* When the skyliner goes down, they run skyliner route buses from Boardwalk resort--so you don't have to walk from World Showcase back to the front of the park to catch a bus.
We only rode once, but waited well over an hour. I don't think it is ever a walk on unless you happen to get an early boarding group and it starts on time. The fact is, it has some downtime most days, it is very glitchy.