I think more important than bitcoin is the idea which is in all of our heads now, the idea that we don't need the state for money anymore.
I think you need to have some authority that limits the number of different cryptocurrencies. BTC has all the momentum right now, but if you're like me, you should be worried about a future with thousands of equal cryptocurrencies, and new ones being created daily. This would go against the very idea of a limited supply, because in such case, the monetary unit wouldn't be BTC any more. It would be "a cryptocoin".