Since poolhopping is essentially an unwritten perk, with the warning to call ahead before venturing out to hop ---I could see them simply "closing" the SAB to hoppers most of the time and any other pools they feel are threatened by excess hopping without ever actually having to "take away" the perk...
This allows them to continue to use pool hopping as a selling point even after it is for all purposes gone or at least unlikely (like being able to exhange EASILY for ANY timeshare week/place in the II list)...Here's the pitch:
"You can go to any pool on property!!! (depending on availability,of course)"
In my scenario, SAB will just rarely be "available." (January)
Paul