I'm not '74, but I wanted to add my own statement and comments to that query. There were a great many factors that caused Disneyland's cleanup, and I really doubt the anniversary played a huge role in that change (it just gave them a central point to work around and make it seem more official). At the time, Disneyland was suffering from a massive PR scandal due to the deaths caused by improper attraction maintenance. The fanbase was rallying against the management and even the mainstream media was involved. They were basically forced to do something due to all the negativity and scandal surrounding the park. There was also the benefit of having a CEO that actually did seem to enjoy and care about the parks when he was paying proper attention to the way his company was working, and Eisner appointed someone who knew how to handle park management to a position of power at Disneyland (until he was fired under Iger's new reign). In the end, there were a lot of important elements that led to Disneyland's cleanup. Things that aren't in play regarding Disney World and the current state of the company.
WDW has literally none of those factors at play to provide the company with any incentive for a cleanup of the way things are maintained. There have been close shaves of falling rockwork and props in several places (Splash Mountain and Tree of Life for example), but so far no one has died as a result. Unlike Disneyland, there's really not a diehard dedicated and organized movement in the fanbase to try to save the parks (nor a vocal and well respected Al Lutz like figure to rally support). And the mainstream media as a whole isn't spreading much negative news about the resort, they have in fact largely been shilling for Iger and the way Disney World is run. 74 has stated that Iger (along with his fellow high-level executives such as Rasulo) has absolutely no interest in the parks and in fact holds contempt for the parks and the guests who visit them. He in fact considered selling the parks within the past few years and shopped around for potential offers.
Unless leadership changes (and with Rasulo supposedly the front runner as Iger's replacement, things may end up far worse than they already are), it's going to be even harder for change to occur at WDW than it did for Disneyland. It may happen, but it'll probably take a long time and require a fundamental change in the way the company works.