Well that's what happens when Disney let's an entire park and Future World rot for a decade or more.
But you can't go back and fix those wrongs. You have to do your best to fix the mess and make the parks top notch again and as we've seen with what Comcast is doing with IOA and USF, it doesn't happen overnight. They've done a lot in a short period of time, yet still have a long ways to go.
Moral of the story is these things take time. Not saying let Disney off the hook if it takes them forever to build SWL, but that once that is done, more still needs to be done obviously, and that's where we'll see if Disney is truly interested in making these parks "great" or just "good enough".