A couple other thoughts on RIV resale restrictions.
1. The restrictions also affect non-RIV resale contracts and, as time goes on, a greater and greater percentage of other
DVC resorts will be held by resale owners who will also not be able to book at RIV. No, that won't affect the 7-11 month window, but it could alleviate pressure on the resort overall. Of course, that will be offset, to some degree, by direct points sold for new resorts as they come online - we really don't know how that balance will play out over time and it could fluctuate depending on the percentage of resale contract holders vs. how fast new resorts come online.
2. Non-RIV resale contract holders, over time, will have less and less resorts for which they can use their points at the 7 month mark - so, if there is increased pressure on the 7-11 month booking window at RIV, that will also eventually happen with resale contracts at other DVC resorts too. If that happens, it isn't going to happy at just RIV (although RIV might be the first), and that could be something where Disney decides to do something (for example, provide a $$ way for resale contract holders to bring their points back into the fold). That said, as
@muppets3d pointed out, that is also how DVC works, and I'm not sure your average restricted resale contract holder is going to be any more or less likely to effectively plan their vacation far enough in advance to put any more pressure on the 7-11 month window than will exist when the resort of sold out.
3. I suspect most folks currently in the market for a resale RIV contract are either (1) already direct RIV points holders or, (2) people who hold resale contracts at other DVC resorts they can't use at RIV, and just want some points to use at RIV. Group 1 are just looking to increase their direct points at RIV for more/better bookings - presumably they are are already booking in the 7-11 month window, but looking for different rooms, which is just going to shift demand. And, as direct holders, they may well be using a fair amount of their points for other resorts once the 7 month window open up. Group 2 are probably not looking to make RIV their only/primary DVC home and could be buying points they only plan to use once every other year or just a few days here and there.
Bottom line, none of us have a crystal ball as to exactly how it will all shake out. There are a lot factors at play. Of course, I'm sure we all wish DVC had never implemented these restrictions (and hope springs eternal that they will somehow reverse course), but it may not be quite as bad as some anticipate in the future. On the other hand, as a direct RIV owner, I could well be whistling past the graveyard to justify my next purchase of RIV points!