[stomachmonkey]

I don't know. I'm not sure he has really pursued much of a solo career.

A lot of guys in his situation, money, fame, rep, no longer pursue their career in the same manner.

They have reached a place where they can create for their own personal satisfaction. Has nothing to do with the commercial success of the work.

After Bonham died he did not touch a guitar for years, may have been as long as 5 years IIRC. He just lost the desire.