One interesting comparison in my mind is BWV. I'd guess that the majority of people paying $100+ for a mere 16 years of life left are treating those contracts
as if they were restricted points. That gives me hope that resale Riviera (nearly triple the years left) will have a decent floor on the pricing. A Disney resort (even a contract purchased for a single resort, whether functionally or legally) has a tangible value that keeps resale from going to zero IMO. Perhaps roughly the premium the people are paying for
DVC over other timeshare systems.
In the end, I'd bet resale RIV will hold up better than many are predicting, but it really won't matter in 20+ years since I'll be well past my break even point.