The little important things are starting to slip...As for cleaniless, it is still leaps and bounds above any other "park" I have visited. Although this year I felt it slipped. 50% of the bathrooms we used were dirty (I had to open quite a few stall doors before I found a "clean" one {a first for me at WDW}). I can't tell you how many cockroaches (at least 4 in. long if not longer) (the kids couldn't even sit to watch the parades) we encountered (I stopped counting at 35). And then last but not least, the 2 foot rat (not Mickey) at The Brown Derby.
I'm sorry, "starting to slip"? Are you saying if you saw roaches or a 2-foot rat at any random restaurant in your hometown, you'd just shrug your shoulders and go back the next week?
A stray piece of litter on the ground should be unacceptable at Disney. What you're describing should be unacceptable anywhere. But as long as people continue to overlook things like this "because it's just so darn magical," the parks will continue to slide toward what Walt was trying to avoid in the first-place.