Not dependable at the moment, but for risky business like forex bitcoin is good thing, since mostly that people use bitcoin are speculators that want to get profit from the difference. I already saw a lot of brokers(mainly from Russia or Cyprus) accepted bitcoin as one of the commodity for trade.I don't find Bitcoin as a dependable currency or shall I say a tool... it's too risky for the trading and can up/down by a large margin in a matter of hours only.