On the other hand, Ghibli owns a bunch of highly valuable IP. When it comes to business, they could easily survive for decades selling stuffed Totoro and Catbus figures.
I don't think Miyazaki will allow his works to be adapted or remade during his lifetime, but once he's gone the new management might find it hard to resist licensing deals with Hollywood. I for one would love to see someone like Denis Villeneuve take a stab at Nausicaa (the manga version, not the anime) one day. Due to time and budget constraints, Miyazaki's own film barely scratches the surface of the epic saga he had envisioned.