They may never need to extend memberships beyond 2042 at this time, even for money. Too much trouble at this point, especially, if every member has to agree.
I can see them re-selling
DVC contracts at the existing DVC resorts beginning in 2042 instead. Most likely existing owners with expiring contracts will have an opportunity to re-buy their contracts at a discount. Otherwise, all points revert back to DVD and they can sell them again for mega $$$.
Maybe the new contracts will be for 12 more years, but most likely it will be for longer.
If this is the case, DVC will also probably take the opportunity to re-adjust all the point usage at the resorts.
This is all JMO. Absolutely no basis in fact or even rumors. It's what I would do if I managed DVD.
Btw, I voted to extend if it was free