User blog comment:Timeoin/Dragonborn Screenshots/@comment-4043978-20121119225120/@comment-1600847-20121121210458

I'm not sure what page it's on, I read the book last year online and don't recall.

And while yes, disappeared does not equal kidnapped, the point is that he's gone. Odds are we won't see him again, just like we won't see a lot of important characters from previous games again, since their story is over. Especially since Vivec isn't a god anymore, just your average Chimer, whether or not he was taken into Oblivion.