I would consider a 2042 resort IF I knew:
a. That Disney would offer an extension option for current members
AND
b. What that option would cost?
I do believe that extensions will be offered as they were previously at OKW, since trying to resell several resorts all expiring in 2042 at the same time does not make sense to Disney, however I expect them to come back at a much higher cost per year for the renewal - perhaps a 10 year term at $30-40/point (or more by 2042!), as opposed to the 15 years for $15 that OKW owners were previously offered.
I'm also concerned that the high relative value of BCV could cause Disney to decide to take the entire resort back in 2042 either for resale or to convert back into a traditional resort, or to charge a higher renewal price as we see with the variable direct pricing for sold out resorts, while others like Boulder Ridge or Old Key West would be more advantageous for DVC to just renew and enjoy a steady flow of renewal income without costs of developing and selling a whole new resort.
Buying 2042 resort contracts, either direct or resale, would be much more attractive if Disney were to have an "add-on" option available at closing with an established price so you know exactly what your options will be beyond 2042 at the time you're looking to purchase.
I plan on using my contracts for a long time, potentially past 2042, but I also have some security in the fact that my 2054 contract will likely hold value for a longer period than the 2042 resorts, which will likely start to significantly drop in value without a renewal option over the next 10 years. There becomes a point when the value proposition is no longer there to spend $130, $150, or $170 per point on a resort, plus maintenance fees, with only a few visits left on it, especially for someone who may be buying a smaller contract with the intent to only use every other year.