My prediction is in 10 years, they will stop doing anything with the 2042 resorts and contracts still owned. The resort is theirs as of January 31s, 2042 and they don't have to buy it from anyone.
What I also predict is that a few years before 2042, they will take some (if not all) of BWI and BC hotels and convert them to
DVC, and begin selling as new DVC resorts, with new 50 year contracts, new
point charts and of course, resale restrictions.
This way, when the current rooms expire, they can then work on renovations of those, and add them back into the new condo associations for those resorts.
There will be no extension for current owners...but I could see them giving all DVC owners, as they do now, some advance notice or incentives for buying.