I don't necessarily want him to have an important part or anything like that. Just a reference to him in a book, or in a overheard conversation or something like that.
That's not what you said in your poll question or your first post, though--you said you wanted to "see" him again, even if only in a cameo (indicating an actual appearance). That's why I voted no.
Not that I didn't like old Janus. I thought he was a cool character, too. But I'd like to see new characters in Skyrim.
(If there had been an "I don't really care too much" option, though, I would have probably voted that.)