They might be able to add more restrictions in new associations, so, as they build new resorts. But right now, the key stuff in the contract is that they can restrict Incidental Benefits.
The property interest in your Home Resort, and the secondary resort booking, are not "incidental benefits."
DVD has always said “You should not purchase an ownership interest in reliance upon the addition of other resorts or the ability to reserve at the other existing DVC resorts after the applicable term of the DVC resorts.”
They also have said “Do not purchase your ownership interest in reliance on your ability to transfer these products, services and incidental benefits if you sell your Ownership interest or based upon their continued availability." (Referring to Concierge Collection and similar, i.e., the non DVC resort access privileges.)
Transfer and will of ownership interest is permitted. Selling and rental has always been restricted/controlled. Incidental benefits have always been defined as non-transferrable.
So it's easy for them to do what they're currently doing. It's harder to change the 11/7, save insofar as they've always said that when a resort RTUs, other resort owners ain't going to be booking there anymore neither. OKW, BWV, BCV and VWL will all RTU in 2042 (save that one part of OKW).