As I see it, butcoin as well as the other cryptocurrencies does post a threat to banks. Last time I told my brother to open his own bank account, he told me, why should I open a bank account if my online wallet does the same thing too. If the young generation thinks the same way, then cryptocurrency does post a great threat to banks, I cant blame my brother, online wallets and trading sites are better than banks nowadays, but thats only my opinion.