They would have to close BRV, renovate and sell it as CCV2, similar to what they're doing at VGF, in order to do what you propose. That's a 26-year extension, but it still involves SELLING those extensions.
As does SELLING a new BCV and new BWV. And until those points sell, DVD is on the hook for the maintenance costs that those defunct resorts shared with the hotel side.
I'm not under the delusion that DVC will offer 25-26 year extensions on those resorts. But I don't think it works in their favor to close all 3 at once (no more dues-paying owners to cover maintenance costs), renovate all of them at one time (a large capital investment) and then place them all on the market to compete concurrently for buyers. It would make more sense to offer extensions at all but 1 resort, close that resort, renovate and begin sales. Then close a second resort, and repeat the process until all 2042 resorts have been repackaged and sold as new resorts with inflated
points charts and contracts that no longer expire at the same time.