That's actually not a bad idea!
Suppose you used 5 different password managers, and each one stored a password. Then, a password manager manager would glue the 5 passwords together to get the final password. Or maybe hash them to produce the final password. That way, when one password manager is cracked, it would not be enough to get your password.
Of course, then the password manager manager could be cracked. Hmm.... so you would need 5 password manager managers. Which would require a single password manager manager manager.