The Hacker News response to Dropbox is probably the funniest ever.
As a linux user, you can already build such a system yourself quite trivially by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem.
If you can't deliver the value of what you described to normal people, it just doesn't matter. That's why Dropbox is a $7B+ company today - because they were able to commercialize something that previously was only accessible to a few people who knew weird computer commands.
To the normal person none of this is "quite trivial".
EDIT: I missed the joke. I get it now. Well-played OP.