The (relatively) recent glimmer of hope for the parks: Carsland
What's we've seen in the past, both good and bad, is that what happens at DLR does not necessarily translate to what happens at WDW.
Several have suggested that John Lasseter was the creative driving force for Cars Land and the rebirth of DCA. Lasseter had sufficient power within corporate Disney to effect the change he wanted at DLR. It's been suggested that Lasseter cares little about what happens at WDW.
Similarly, J.K. Rowling drove the resurgence at Universal. She didn't care what happened at Universal per se, but when she fell in Universal's lap after being badly mishandled by Disney management, Universal was smart enough to give her pretty much everything she wanted.
Now funded by Comcast's deep pockets, Universal has rediscovered the mantra of theme park expansion.
Universal can be expected to continue this trend as long as their management sees financial results. Once the creative minds at Universal stumble (every organization stumbles from time-to-time) and one of their investments fails to live up to financial expectations, Universal might be at risk of falling back into the same behavior of the current WDW. We'll see.
It's a case of the adage that success has many fathers but failure is an orphan.
It takes an incredibly talented organization to learn the
right lessons from its mistakes. Even more so to not let immediate challenges detour it from its long-term goals.