Post-D23, I'm actually less concerned for UOR than I was last week. Don't get me wrong, I think Disney has a bunch of great looking stuff on the way, and they're poised to turn MK specifically into a juggernaut, but the Disney timeline is very vague, and likely protracted. It's going to be more than a few years before all this comes online.
We know nothing about the Epcot redos, and I doubt we see Villains land in the 2020s. I also think it's a stretch to count Piston Peak and Monstropolis as significant new lands, but maybe the execution on those will prove me wrong. Monstropolis looks cool, but beyond the coaster, the land itself doesn't feel additive compared to what was there before.