I actually think Seven Dwarfs is pretty good - it needed one more dark ride scene to feel complete.
I understand where you’re coming from with Riviera or Poly, but none of the three mentioned structures replaced anything remotely as elegant, integral, and impactful as RoA. I think when the walls fall guests will realize how important RoA was to the experience of a huge chunk of MK - they’ll feel that the loss stretches much deeper then a few attractions they largely ignored. I think the ride will play like a less impressive Navi River Journey - very short, reliant on empty environments, with a couple impressive AAs at the end. I expect Disney and a lot of posters here will want to very quickly shift the conversation to Villains.