Ultimately, the value of a contract *has* to go down---if for no other reason than the system is RTU. This could move it ahead, but only by so much.
Where do those extra buyers come from?
Timeshare isn't like oil, or wheat, or another commodity good. It is a luxury good. (Yes, as hard as it is for some DISers to believe, Disney trips are not in the same category as food, clothing, and shelter.) Demand for timeshares doesn't "naturally" exist---developers, like Disney, manufacture demand, through a carefully orchestrated marketing and sales process. The whole pitch about "not like other timeshares"? A key part of that sales process---and one they still use, despite the fact that practically every other timeshare is now also point based, with flexible booking, etc.
Most people who go on a tour, and hence most people who buy DVC, never seriously planned to do so before they went on vacation. They saw the DVC TV channel, or maybe saw the kiosks in the parks, and decided to take a tour. They might have even heard of DVC, and thought it worth looking into, but did no serious research before they left home. The tour then capitalized on that "magic vacation" feeling, offering the chance to bottle it and keep it forever. Demand is
created through that process.
The DVC tour is a lot more subtle than a "regular" pitch, but it works in fundamentally the same way---build a rapport, demonstrate the value proposition ("luxury lodging for moderate cost"), appeal to the prospect's sense of "wanting to belong" to something special, etc. Disney doesn't systematically use the "take away"---this is where the front-end sales lead sets the tour prospect up in a position where he thinks buying will be out of reach, only to have "a special deal" cut for him by a "manager"---the "manager" isn't, and this is the real sales price. But a few Guides do use smaller versions of it by insinuating that maybe the prospect isn't in a position to buy...especially if the prospect is only marginally qualified (and, probably shouldn't be buying.)
Most of the well-informed prospects who have a clear understanding about resale will go that way even with these changes, because financially they are immaterial. Those people are not going to be swayed, and will still be there for the resale seller. These changes are designed to deflect the objections of a tour guest who has heard of resale, understands it is probably cheaper, but doesn't really know the dollars-and-cents figures well---and, such a guest is unlikely to find resale unless they do serious research during their rescission period, because (again) they didn't have firm plans to buy in the first place. Most people don't do this, in part because they don't really want to know any reasons why they should rescind---because that would mean giving up this special thing that they are really proud to have purchased.
So, I don't think this will be a serious drag on the resale market, because folks who are seriously examining resale will see these changes for what they are---smoke and mirrors at the margins of value. But, let's assume for a minute I'm wrong. If I am, then there will be fewer buyers for the available sellers. That will lead to a lower equilibrium price, at which point some sellers will decide not to sell after all, and/or some buyers will decide that this new lower price makes DVC an attractive option at last. Eventually, sellers will find buyers. The only question is: at what price.