That's not really true. Some owners bought the extension, so they won't be handing back their points until 2057. Between 2042 and 2057 OKW might be a mess with fewer owners, but that might be made up by the demand to stay there by people who own at other resorts and want a bargain use of points.
Second, I wonder how much of the original building will remain as is once Disney takes back the property. For one thing, the buildings will be 5o-60 years old. There has to be a point where they would need a major overhaul, if not a tear down. Especially if
DVC is going to resell them. Look at the Poly rumors of the building being completely destroyed and rebuilt.
Which leads to the next thing - OKW has to be the most spread out DVC property. Not only are the rooms large, but the open spaces, the golf course, only 2-3 stories high, etc. Anyone think a new DVC resort anywhere would leave so much open space or would they add more rooms? Again, the Poly rumors about the higher buildings and lees open space could be a hint.
And if DVC offered the "new" OKW points at $70, w/o restrictions on trading to other resorts, I shudder thinking about the affect this would have on booking at another resort where you don't have a home resort advantage.