You could say that about any of his creations…. Yet he demonstrated time and time again a willingness to let go to chase his next interest.
People think he might hand off and move on… because that is exactly ehat he did time and time again
I think just based on his age alone he may have let some others pick up a bit more of a slack with things. He was going to get older, I have a hard time seeing him let it go completely though and not have the final say on things. When you hear him say "Disneyland will never be finished" I think that alone is the thing Walt wanted all along. You can make a movie like Snow White but once it is done it is done. Disneyland would never be done, or WDW. I don't think he'd ever get bored with that. Naturally we don't know just how much age would have an impact on him. He died at 65 so we still have this image of Walt where he never got truly old.