I share some of your concerns about the resale restrictions, and while I wouldn’t be surprised if Disney eventually relaxes those, my other thought is this:
There will always be someone who wants to buy at a specific resort, regardless of the restrictions. (Related: There will also always be someone who wants a smaller number of points, regardless of resort.)
My husband and I bought into Riviera on our last trip, and our Welcome Home visit is coming up (6 weeks to go!). I’ll admit to a lot of second-guessing, but Riviera is ultimately where we want to be, and I’ve done the math on when we can go and how many trips it will take before we start coming out ahead (somewhere between 2037 and 2045, depending on increases in hotel costs and whether we add on like we’re thinking we might) and thus when we could start considering a sale if we really had to.
So I’m not concerned about being able to either use or resell at the Riviera. If I were, I wouldn’t have bought it. Hope that helps!