While it may indeed, for now, be the 'linux of currency', in my opinion, in a bit of time, when we develop even more, it won't be so.
I believe it's possible to reach a level where even your avarage John would be able to use bitcoin, duh, he might now even be avare he's using it, as it may automatically be showns as usd or some other currency. We're slowly moving towards world without cash, and it such a world, bitcoin could be a big winner in my opinion.
So... It's just a matter of time.