This thread has been around for 8 months now,. If attendance declines were going to precipitate a fundamental shift in pricing, it would have already happened. Considering how high revenues continue to be, I think they're generally comfortable with where the pricing is right now.
On the other hand, you're right about the need to add more. I think prices will remain high for the foreseeable future, but the only way to keep people paying the higher prices is to add more content.
Personally I really like this idea, but it goes against the idea of making the parks "more accessible" by breaking costs down. Some might see the current situation as "nickel-and diming" people by charging for additional perks, where for some, the barebones admission is all they can afford and the only way they can buy into the experience. Disney wants balance, even if the easier option for those that can afford it would be to pay one price for the elevated service altogether.