I suspect that the "back of the envelope" estimate of value will tend to get closer to the rental point cost.
That would be (Purchase price per point / Years on Contract + Yearly dues < $15).
Here I am going make the assumption that all rental points are roughly equal and are worth $15 on the open market. That's not quite true, but this is all estimates anyway. Let's look at "desirable properties" like BCV and BWV.
If we say dues are $7/yr, and the years are 10, this gives us a MAXIMUM value of $80 in TODAYS dollars. Lets call this the "Rental Price"
If the sell price is close enough to the "Rental Price", owners who no longer use or need their proprieties will sell instead of finding renters for the next 10 years. People will buy contracts for the ability to make reservations themselves and to "own the magic" - even for just a short time. With a shorter term commitment people can buy confident they they will be using
DVC for the next 10 years. How close to the rental price will that be? I would guess within 10% of that $80. $75?
OKW has dues of $8/yr and has a "Rental Cost" of $70 per point 10 years out. I doubt OKW will be near $70 per point., but I suspect it will be closer to the rental cost than it is now. I might hazard a guess between $55 and $60 (once again in TODAYS $$ - not accounting for inflation or Disney above inflation price hikes.
In the last few years, I think the equation will hold, but there will be less incentive to sell. Renting points a few times is easier than selling. I suspect it will not be a matter of value, but whether it is worth the trouble to sell a contract
with 5 years left on it....
MB