It has been estimated that on average 1% of DVC total inventory is resold every year. This vary by resort: a new resort trades much lower than that rate (RIV is probably not at a much higher rate than 0.01%) and then it accelerates a bit. Probably SSR is the one that trades highest.So all resale prior to 2019 is treated on par with DVC direct points? I also would be curious to know what fraction of current owners are direct, resale pre-2019, resale post 2019 at unrestricted resorts, and resale at RIV (I assume we are still at/near zero resale VDH at this point). It doesn’t seem like it’s that much easier to get bookings at RIV than the other resorts at <7mo, so I would think the percentage of us with post-2019 resale can’t be that huge.
I haven't looked into the data myself and I'm just quoting posts made here in the past, I cannot guarantee this is correct. But let's say 4% in 4 years. We have to account that some of those points have been purchased as addons by people who already have unrestricted points (direct or pre-2019 resale) so they can use their unrestricted points to book RIV and VDH and their restricted points for other resorts. This makes those points almost unrestricted when we consider their effect on booking patterns for restricted resorts.
So maybe 2%-3% points are currently owned by owners that cannot book the restricted resorts? I think it's far too low to see any effect on booking patterns yet. Other things (like the propensity of new owners to stay more at their home resort initially) have a much bigger impact.