I agree that the main factor that will affect resale prices is how hard it will be to book Riviera at 7 months (combined with whatever the point cost becomes for direct Riviera, especially when the resort becomes “sold out”).
I would hesitate to assume it will be easy to book at 7 months based on the fact that Riviera is pretty large. It is compared to some resorts, but at the same time (just like all of
DVC) the points sold are based on full occupancy... so once it becomes sold out, you will still have the same proportion of owners trying to get rooms.
I would base my guess on other factors, particularly aesthetic appeal and location, which would in turn increase the amount of folks trying to get in. Nothing against SSR, but as an example, SSR is further from parks and (in the opinion of some) doesn’t have particularly “special” theming or aesthetics, which means you have a lot of people trading out to stay elsewhere... which leads to a lot more availability at 7 months.
In contrast, Riviera is in a pretty decent location, and many folks seem intrigued by the decor, etc. I think this will result in more owners actually using their points AT Riviera and not trading out, leaving more of a rush at 7 months for the leftovers (that I think will also be in demand). Then, if you want to stay there, your main options besides renting are to buy direct at what will likely be insane prices or snag a significantly cheaper (but maybe not dirt cheap?) resale contract.
Sort of veering off the point, I do think/hope studios will be more available to everyone vs, say, CCV... I don’t know the exact point breakdown but I assume the lack of cabins will help.