If DTD is just a place to hang out and enjoy the ambience, why go through the hassle of parking and dealing with crowds? There are other outdoor malls with ambience and shops that people actually shop at that aren't tourist traps.
Sure, just like any new ride, the attendance falls after the Disney geeks have done it. Let's face it, there isn't a lot of reason to go to DTD that you can't do anywhere else. It is just an expensive outdoor mall.