I think Fastpass/Maxpass is a long way off because it make the logistics of distancing in the lines a lot more complicated. Even stuff like where to funnel those lines where they’re be side-by-side with the regular lines would be a bit of an issue for many rides. (More plexiglass?). You’ve also got to staff return lines, etc... I just think it’s a hassle that they don’t “need” to deal with, so they won’t.
As for wait times accuracy, previously they had a very good idea of “Peter Pan’s line is to X spot, that’s about X many people and the line will take X amount of time.” Now there are way more variables, so I think that accuracy is probably much tougher.
One nice thing is that I think lines are so much more palatable when you’re constantly moving, which was definitely true with the distancing and lack of FP “stops.”