I've always thought they would eventually follow in Diamond/Marriott's path: creating a product that is a non-deeded usage assignment with a fee structure or new purchase requirement to "requalify" the points if they are sold. I was a little surprised that CWA did not do that.
Edited to add: now that I think about it, I suppose that's actually quite like what Disney is doing. For those that don't know: their newest resort is, essentially, a distinct "club" with a 1-1 exchange program between it and existing resorts. However, only developer purchases can participate. If you buy resale points at the 14 older resorts, they can only be used in one of those 14, and cannot be used at this, the 15th. If you buy resale points at the 15th, they can only be used at that resort. Presumably each new resort going forward will follow the same model, and be a standalone "club"--at least, it will if this restriction doesn't give too many buyers cold feet. (And I don't think it will). As far as I know, Disney does not offer a way to "requalify" those points. Yet.