The "problem" is that, in Japan, Ghibli is much more than a studio movie. It's a profit machine for merchandise, books, and theme parks. You can't just let that fade away.
Disney itself went through rough patches, where the new generations either defected (Don Bluth) or disappointed. Ghibli started going through that; Gorō Miyazaki can keep the flame alive for the time being, but nobody is under the impression that he can take it to new and sunny uplands. The question is whether they can find somebody who can, in the way Disney got Michael Eisner. What they really need now is a successor to Toshio Suzuki who can attract new talent the way Suzuki used to do.