It seems like the immediate future, at least, is diverse. Thin, thick, everything in the cloud, your machine is also a server, closed, open, appliance<p>The PC has been extraordinarily open so far, when you think about it. Imagine users of a phone or music player being given easy tools and encouraged to tinker with the way it stores music or contacts. Sounds outrageous.<p>The reality is that many (maybe most) users are confused by the fact that they can to music via itunes or via the file system. They definitely don't want to think about whether or not itunes is making a copy of that mp3 file in a different format, just remembering its location or moving it.<p>Open comes with a learning overhead.