My ds and his wife frequently drive over to DTD for the evening. I know that they wouldn't do that if they had to spend money to park. DTD isn't a theme park, it's a shopping/dining area. If locals have to pay to park there, they will stop going.
Yeah, I realize that City Walk charges to park as well. But, that's a whole different thing. It's much more adult...so those heading to City Walk, after park closing, tend to be adult and are looking for adult entertainment. That is not the case with DTD.
Parking spaces are not a big deal at DTD. There is always parking.....you may have to walk a ways, but there is plenty to go around, especially if you're talking about spaces taken up by those who then take buses to resorts in order to access parks.
Seriously, this just isn't that big a deal. There really aren't all that many people parking at DTD in order to avoid parking fees at the theme parks. It's a non-issue. I mean, get on the CR bus at DTD...then watch how many people are then walking directly to MK from the bus. Just not a big deal.