Every single resale is not a lost retail sale. I originally looked at direct (didn't know about resale) and didn't buy because of the price. It was only years later that I found out about resale and purchased. So Disney was never ever going to get my money with a direct purchase. The music industry thinks the same way and counts every pirated song as a lost sale, but it isn't.
Even if there were no resale market at all, as direct prices increase, Disney is eliminating potential buyers who can't or don't want to pay the direct price. They are effectively shrinking their potential client base.
I'm betting more and more people are going online within the 10 days of signing their contract and finding out more about what they have just purchased. How often is the advice we give here "if you aren't sure cancel your purchase and do some more research into DVC and make sure you look at resale". I wonder how their cancellation rates are trending.
What they could do though is sell small exclusive resorts (GF & POLY) for high prices while driving down the resale price of everything else ($1/point) and then ROFR whenever they needed points for a cheap direct sale ($80-100 point).
If I was a greedy evil coporate type, this would be my plan to squeeze every dime I could out of my customers.