That's great for power users but, I could guess that the average Mac user hasn't ever typed a command into Terminal.
This was the top comment in the Dropbox Show HN thread:
"For 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. From Windows or Mac, this FTP account could be accessed through built-in software"