What if there is a bug with one his modules?

Yeah, so what? Did you have him sign a contract that he will give prompt support to modules he has released? I don't think so. If you find a bug, fix it. Release a patch. Volunteer to take over maintainance of said module - he's been asking for maintainers of his modules since at least YAPC::NA 2002.

In that case you contribute a lot more than suggesting the world is coming to an end if Damian takes a 3 month break.

Abigail