To do a casino or to do a great casino they would have to build in Las Vegas. Unfortunately, Las Vegas has changed its image back to "Sin City". Awhile ago they attempted to be a family town, but that concept has changed. This change has limited Disney since they would be isolating the family, which is Disney's target market.
I just don't see it happening. The lack of a casino on the cruise ships goes to show that Disney is concerned with the family being together and with casinos (or rather laws/regulations) requiring no one under a certain age is allowed on the gaming floor, this would separate a family more often then just swapping out a child on a ride.
Husband: You hold on to the baby while I play Roulette.
Wife: Ok, then when you are done, you come back to the waiting area and take over so I can play slots. :lol: