I can easily believe that bitcoin won't be the one. While the conspiracy three letter agency/bank stuff doesn't turn me on, what could be a more perfect plan than planting the seed, prick the greed of a bunch of fractious techno weenies, let them do all the technical heavy lifting, kill it off themselves and then reap the technical benefits?
I am sure that Bitcoin and other cryptocurrency will exist in a long period of time. Lots of people are using it, lots of people are stil discovering and upgrading the Bitcoin so that people, rich or poor may use it in their daily lives. I think It will survive just like other kind of money such as the Fiat Money.