Heyman: 'There will be nothing quite like Harry Potter again' 

Î think he's right. There might be other booms and box office hits, but the HP phenomena will always be unique because it was the first. It basically paved the way for the following hit products.

I think what he says is right not only for the movie industry but also applies to the publishing industry. I don't think there will be the same litterary phenomenon for quite some time either.