OK, so what he basically did was get all excited about Disneyland and within a few years redirected his energy toward the Experimental Prototype City/Community (Depending on where you see it) Of Tomorrow. And although mildly interested left the day to day operation of that to staff and went off in a different direction and, like stated, really wasn't around long enough to really know what he would have done if he perceived there to be a problem with the parks. Quite frankly, he pulled an Iger and because Disneyland was making a fortune at the time, directed his attention to something else. Iger to IP's and Walt to EPCOT. He might not have done anything at all or even cared what happened to the parks. We really don't know and he didn't leave a note to tell us either. He did ask Roy to continue with EPCOT, but, of course, he didn't.
That leads me to the next thing. The comments that it wouldn't happen if Walt and Roy were still in charge. Make no mistake about this, as long as Walt was alive, Roy was never in charge. But, I will gladly give Roy credit for the fact that without him WDW would never have been built, but, he really didn't stay around long enough to see what, if anything, he might have done.