Hmm, I feel like I read both...too much money and Rowling/Warner wanting to keep a lot of creative of control...which, honestly, who can blame Rowling? She had a specific world she/the books/movies created. And honestly, I could have seen Disney attempting to do some things 1) on the cheap, not the way Universal did it 2) "kiddifiying" Potter to such a degree that it wouldn't have been as much fun. Like the HP ride in the castle...it definitely has some scary elements to it especially if you don't like spiders
I don't know if Disney would have gone for something like that or not. It's definitely not the most "family friendly" ride.
I understand Disney wanting creative control but this was one area I think they should have let a bit go of, just sucked it up and let Rowling have a lot of control. Uni made a wonderful area that if the "insiders" on this site are being truthful has Disney unnerved and freaked out by.
But regardless of why they didn't go for it, I still think it was a really big mistake on Disney's part. Look what it has done for Universal. It revitalized a lets face it, park that was to a degree dying a slow and painful death. Hardly any money was being spent on it, it wasn't making any money and it's owners basically wanted to shove it off on someone else. And now, it's making money and it's new owners are investing heavily in it's future.