Well, I do think that part of BLS's point was that the game, while solid on it's own, sells mostly because of it's roots - Not so much Final Fantasy as Disney, but all the same.
If it did the same thing with the same sales numbers and a completely original cast, BLS would have to bite his tongue.
The problem with the Disney cast as it stands though is that they don't matter much in the story and they don't blend with each other, something that major Disney fans would like to see.
Though in the next main title, the story will probably involve less Disney characters and may blend some Disney worlds, so it may work out for the better.