As a DVC member, I'm thrilled to see Disney finally beginning to crack down on parking at resorts.
Poly/GF/YC/BC/Boardwalk parking can be nearly impossible for people actually staying there to find a spot during the day, only to find the lots half empty after the parks close.
I've never really experienced any parking problems at WL, but I guess if they're enforcing the policy, it has to be across the board.
If they wanted to accommodate legitimate diners and "resort visitors", they could easily implement a time stamped ticket system for guests not staying at that particular resort. Guests get "x" amount of time to eat/tour, and if they stay over that amount of time, they pay MORE than a full day's theme park charge for parking.