Restricting benefits of resale could conceivably backfire -- that is if buyers actually consider the true value of the points they are buying (equity). So far,
DVC points have retained, relative to other timeshares, a lot of their value.
Restricting resales and the resulting drop in resale value, reduces the equity of points bought from DVC itself. They will become more like regular timeshare purchases that owners can't sell if they need to.
Lower resale value may cause purchasers to consider buying where they want to stay at resale and saving a lot of money. -- And not losing as much money if they decided to sell their points.
Can you imagine buying BLT for less than half of the original cost? I'd certainly consider it.