It's sad because (if the sites don't come back) it'll be harder for other people to find and enjoy his work that I enjoyed. And it's sad to think that maybe he won't come back and publish more awesome stuff. (But when I think about it, I doubt that someone with _why's drive to create will be able to keep from sharing for very long.)
Why strikes me as the kind of person who would delete his online presence on a whim, just because it would be fun.