How is Dre falling off?

His first album was "The Chronic". Nearly everyone would consider it a classic. His only other solo album was "Chronic 2001". And once again, many people consider it a classic. Just because he doesn't constantly drop albums doesn't mean that he's falling off. He just enjoys producing more than rapping.

Will somebody please explain how an artist, in which every album the dropped was considered a classic, in some way is considered to be falling off?