I think it is a silly article with a link bait headline. The author has taken his very narrow use cases and extrapolated it to all users. If he can replace dropbox with evernote then he is using dropbox in a very different way from me, not to mention that his implicit message seems to be that all operating systems are going to become Apple-owned, which is silly. Yes, icloud might hurt dropbox but that's a far cry from a death knell.