As far as an extension, if they offer one, I'd expect the offer to be made much closer to 2042. OKWs extension did not garner the support that they had hoped from the membership. I'm thinking possibly because many of us original owner will be very elderly or not around any more by 2042, and we decided to let our heirs worry about whether they want to commit themselves to the expense of an extension. Plus, the extended points really aren't bringing in enough difference in price in the resale market to offset the cost of the extension.
The extension for OKW was a challenge legally, as well. If someone really had the time, desire and $$ to contest it in court, DVC may get a surprise.