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> A de facto standard, > potential opensource clients, > not tied to a specific company,

When the source is closed, and the protocol is closed + encrypted? I think you may be a little optimistic... (Though I do hope that either the source or the protocol get opened)

I think that's what made the original BitTorrent popular. The open protocol. They really need to do the same here if they want this to take off.

Is there any evidence of this?

AeroFS is also server-less, though you can run your own servers.