I think you are asking the wrong question "Disney, what has to happen for you to decide that MDE does not work?"... no its "Customers, what has to happen for you to stop going to Disney?"
I hit that point a few years ago. My husband keeps mentioning going back and I like the community boards, occasionally I will lurk on new threads to see what has changed. I haven't seen anything change for the better.
and (acknowledging that I am old and cranky and have a history of Disney experiences from waaaaaaay back) THAT is why I don't like FP..there are other reasons as well. Change (even with the best of intentions) isn't always good..I see the primary reason for the FP as a way of inducing us to wear the bracelet so they can track our every move (like the I-phone does) and maximize their marketing. Don't forget that, to Apple, the real value of their phones is the culling and sale of your personal data....where you go, what you look at, where u shop, etc etc.....