When it comes to building more DVC resorts or even resorts in general, you really don't want to build to saturation...or to the point were there is no further demand. The only way a product retains or increases in value is its desirability by other people; if a resort just becomes one of many the market will push down the price to the lowest amount people will pay for a generic product. Even now you can roughly gauge the inherent value in DVC ownership by how much a DVC owner is willing to rent their points for. Yes, a while back they were going for $5-$6 a point, then up to $9 - $10/pt just last year, and now they seem to be around $8/pt.
Whether that's a long term trend, I don't know, but once Disney starts building DVC resorts just to fill demand without recompense, the "value" of DVC ownership will diminish unless there is added value artificially awarded to current members (discounts, dining plans, etc.). Otherwise, there would be no inducement to buy, for example, at VWL now if I knew they were going to be building three more wings of them right next to the current one; I would just wait until the cost of ownership fell into my budget and Disney would lose out on a big portion of those that buy on impulse - admittedly not everyone or possibly not the majority, but I would gather a good portion!
Honestly, I would have liked to have bought into DVC at its inception (particularly at VWL), but now it's just too pricey for what I can get out of it since I've moved farther away. Ergo, I would much prefer they start looking at value or moderate "studio" type rooms for people like us that can't spend $200+ a night on property. Currently, they are pushing that market into the seconday market of DVC point rentals since that is the only way non-DVC owners can stay in a studio-type arrangement for less than a king's ransom. If Disney, Inc., ever does build reasonably priced studio accomodations, it's the DVC owners that will take the hardest hit against their rental opportunities.
-R