I disagree.
My own pure speculation is that the extensions are only being offered to give
DVC another 50-year resort to sell while they are still building AKV's Kidani Village and the Grand Californian.
SSR and the first phases of AKV are likely to be sold-out by early '08. That gives them virtually nothing to sell for a year as Kidani will not open until early '09 and GC late '09.
It's always possible that they could extend others, but if they do, I suspect the motivation will be different than is the case with OKW.