I doubt seriously that computer reservations would have any impact at all on resales, and it likely wouldn't have any impact on new DVC sales, either.
I still don't see throwing in more $$ on dues to develop an expensive system that would still require a lot of human interfacing with MS.
Even if they only showed availability and you had to call for a reservation, as quickly as availabiliy changes (I've lost a reservation while on the phone with MS) imagine the following conversation.
MS: "Good morning, Member Services, this is Peter Pan. Could I have your membership number and last four digits of your social, please?"
Mem: "Sure, my number is xxxxxxxxxxxxxxx and my social is xxxx, I'd like to reserve the one bedroom unit that is showing on the internet at BWV for June 1 to June 15."
MS: "I'm sorry, I'm not showing that availability, it must've been filled."
Mem: "Oh, no, it is showing on my screen rght now, I know it is available, and I want it."
MS: "Again, I'm sorry sir, but the system currently shows no availability."
Mem: "Well, let me talk to a supervisor."
MS: "One moment."
SUP: "Good morning, this is Tinkerbell, may I help you."
Mem: "Yes, I see a room available on my screen and I want it, and the other agent says I can't have it."
SUP: "One moment...I'm sorry, sir, there is no availability, would you like to waitlist?"
Mem: "No, I don't want to waitlist, I want the room showing on my computer."
SUP: "Sir, again, there is no room, have you hit the refresh icon?"
Mem: "Oh, well this system is stupid. I'm going to post about how bad it is all over the internet."