I must admit that I worry about this issues as well. As the recent owner of 347,000 FSP resale points (purchased last Fall for $2500, which included closing costs), I am very happy with Wyndham so far. But my usage of these FSP points would be dramatically limited if I was restricted to only using the two resorts where my FSP point contracts are deeded.
It seems to me that based on recent experience, if Wyndham attempted any new strike against resale owners, it would be in the form of dramaticly increased fees. For example, they might attempt to charge a new fee on resale point purchasures who book time at FSP resorts that they are not deeded to. I have no idea whether such a new fee would be lawful, but I wouldn't be shocked if Wyndham attempted such a mean spirited move. I suppose our best defense against such a move would be the possibility that individual resorts would attempt to leave the FSP system if Wyndham became that hostile to owners.
For what its worth, I attended an "owner's update" meeting this weekend with a Wyndham sales representative who made no such threats. While he advised that my resale contracts are "flagged" in the Wyndham system, he only pointed out two differences between retail and resale points. First, he pointed out that I can not qualify as a VIP with resale points, and second, that I can only use RCI weeks and not RCI points. Other than these two restrictions (which I was already aware of), he mentioned no other differences between retail and resale points. I sure hope it stays that way!