But the examples you chose - VGF, VGC, and BCV have two things going - excellent locations and very small (DVC) resorts. You are correct that it's entirely about "supply and demand".
The supply side is easier to determine - as the more points at a resort, the more resale contracts are available. Riviera is looking at around 6.8 million points, versus 1.1 million at VGC, 2.5 million at VGF and 3.0 million at BCV. Even Poly is only 4 million points.
More comparable for supply side? BLT is 5.7 million. AKV is 7.5 million, OKW is 7.6 million. Including SSR - Riviera falls as the fourth largest of the resorts.
If we look at those resorts BLT is selling at $140 per point, AKV is around $110, SSR is $105 and OKW is around $100.
It also has a similar lease life to these resorts - yes 10 years longer, but 40 to 50 years won't matter as much to people.
But honestly, if we look at the demand side - we can get a pretty good feel that Riviera will not be on the AKV/SSR/OKW level of demand. It's location, while not a walk from a resort - would probably be higher than these 3 thanks to the gondola service.
So if Riviera didn't have ANY resale restrictions, we could probably easily predict from this that the demand would be similar or slightly below BLT's demand, since the
point charts are similar as well. If Riviera were built 5 years ago, we would probably be looking at a resale price in the $125-135 dollar range. This makes sense also as a comparative to Boardwalk, which is currently running in a similar price range with a more desirable location and a longer contract life.
The BIG question mark though is "What will the resale restrictions do to Riviera's demand?" This is right now the ONLY resort that will block you from staying at ANY other DVC resort. This means buyers will have to really, really want to stay at DRR. Again using the comparable to BLT....I buy BLT resale, I can still go to VGF or BCV or BWV, or CCV or VGC or Aulani. I buy DRR I only have one spot - DRR. And even worse, the resort will likely be fairly popular, so people owning there will likely find themselves being shut out of the weeks that they want especially in fall frenzy. That reputation will hurt resale. I honestly would expect at least a $20 hit for resale.
SO, in the end, it really will be about whether people love the resort. But at the very, very best, I think you are looking at a high resale value of slightly above the AKV/SSR/OKW set, to somewhere slightly below these three. So looking to the future when the resort has been sold out for a few years, I think that's what you are looking at AKV/SSR/OKW values. I doubt it ever drops significantly lower than those resorts as the location is too good. So again, if DRR was 5 years old, I think we'd be looking at $100-115 per point. Since it's impossible to predict where DVC values will go in the next 5 years, I hesitate to guess real prices. (A true economic crisis could see all resorts drop $30-40 per point.)