I think what people need to come to an agreement on is a hybrid.
It will never be OKW extension but they can still offer an "extension". They simply have you sign full new paperwork and it has an effective date of the future grand opening.
Additionally DVC if needed (because of low prices in resale) buy up things in ROFR for dirt cheap and even offer new members the ability to get 1/2/3/4/5 years at BCV 2042 with X number of points. Then in 2042 their points update to whatever they truly bought with the new
point charts.
Example buy 175 points which is good enough for a studio in the new BCV and they have some equation that converts that maybe to 135 points at BCV until 2042.
Who knows what will happen I agree they will never just extend the current contracts but I don't think they will wait for expiration to start selling the resorts again.