Except the more that WDW fills up with Rainforests Cafes, Planet Hollywoods, Wolfgang Pucks, Cheesecake Factories, and so forth - then how is a trip going to feel any different than a trip to the shopping mall. Not a lot of people will be willing to drop five grand a week just to experience the exact same things they can get a home.
Even Vegas is seeing this problem. Even the high-end versions of chain restarutants are struggling. The successful ones are the unique, "you can only see 'em here" establishments.
Disney needs special restautants, not familar ones.