That's one of the reasons why I don't use biometrics - you're kinda screwed if you can't use it anymore. Another would be that it isn't as secure as it seems.

Generally I recommend memorable passwords, such as using 6 random words (e.g. generated with a wordlist) for accesses you have the risk of typing in yourself. After 10 or so times it's easy to remember if you sort of create a sentence out of it in your head.

For passwords that will only be accessed from the password safe I'd just make it random, since you'd have your password safe. Usually the only time you'd want to change your password is there was an unauthorized login or there's been a breach.