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The benefits would have to outweigh the fact that switching to a new system with limited capability is extremely annoying. The two benefits I can see are a) a global currency for those "in the know" -- cutting out exchange rates and messy stuff like that (and maybe making ID theft harder), and b) security. So the way I see it you'd have to focus on having an insanely secure network for this to work. Not sure I'm seeing just a whole lot of use for this at the moment, but as a way to push BTC mainstream I like it.