I think the initial concept of DisneyQuest was great. The problem is that it didn't work in reality. New technology becomes old technology really quickly and there was no way for them to keep up and have it stay fresh and exciting and interesting.
I also think they made a HUGE mistake when they switched from pay-as-you-go to a ticketed entry. In fact, we haven't been back since they made that change. We're not spending $100+ to go in and play some games for a couple of hours but we would happily pop in periodically if we could just pay for what we did.
At this point, I think the concept is long past its useful life. Close it and put something else there. Sadly, if what they are doing to the rest of DTD is an indication, it will just be more space for chain stores that one can find in any mall around the country. Probably another sunglass store.