I see no reason not to use a functional solution. For me, Bitcoin is the only money I trust in the long run, but it's not a panacea for all the world's problems. It's just a technological solution that has its limitations and can be replaced by a better solution, though I don't see one at the moment. At the same time, it is not possible for me to live on bitcoin alone at the moment because there is no bitcoin job market for my profession.