I think it might be impossible for most of Disney's "deluxe" hotels to get a 4 or 5 star rating. Things may have changed, but the Mobil guide always had strict rules on what amenities a hotel had to offer to get a 5 star rating, things like;
-Beauty Salon in the hotel
-Florist in the hotel, fresh cut flowers available in rooms and throughout property
-Barber Shop in the hotel
-Pool and tennis courts at the hotel (a couple Disney hotels have tennis courts, many don't)
-Reciprocity with a nearby top-tier country club for access to the greens, if not the clubhouse
-Spa/Esthetician facility in the hotel
-Top-tier concierge services (and Mobil would test them!)
-24 hour room service, 24 hour valet, etc., etc.
Five stars from Mobil, now Forbes, is a tough nut to crack. Disney's hotels just don't have the facilities to compete.
There are only so many Five Star hotels in each state. California has the most Five-Star rated hotels and restaurants in the nation by far. A couple particularly stunning Five-Star hotels are a short drive away from Disneyland, perched on cliffs above the crashing Pacific below.
I can't imagine Disney could get there on either coast with any of their current offerings. Especially with their current Cast Member training and standards.