1 - Disney will do whatever it takes to hit their dvc sales targets, and if that means making resales look less attractive by eliminating perks from resales, they will do that.
I've read here on the disboards a different and interesting point of view: it's not DVC interest to make drop resale value too much.
People will still want to get rid of their contracts (defaults, not wanting to go to Disney anymore...), so a resale market will always exist. If resales restrictions would be bigger than now, resales contacts would be less valuable, so the prices would drop.
What if they drop to other timeshares values, sold for 1$ on ebay?
I would perfectly happy to buy points that can be used only in one resort for 1$. I think prices will never drop that much, but bigger the difference, bigger the savings, bigger the interest in the resale market.
If resales value are just 20% less than direct, people would buy direct more. Because it's easier, faster and has some little perk more than resale.
<I couldn't find a smiley that consisted of a bunch of 
