BTC as currently traded is not and can not be a currency. A currency must hold its exchange value within a very narrow range to function as a medium of exchange, which is the ONLY function of a currency. BTC now is a speculative commodity with no value as a commodity...can't eat, burn, incorporate it in manufacture, and exchanging it for actual objects of value is hugely risky for both buyer and seller. The holder of the BTC risks losing it's deflationary increase in value, the acceptor of the BTC risks losing the profit of the sale through the regular and large drops in exchange value.