Of course BTC price depends on demand .But the price of gold, dollar and other values depends on demand .In crypto currency demand will be a long time,
Demand itself does not appear, the source of demand is important. The source of demand for the dollar is a peg to the world economy, through it, almost all payments in the world take place. Gold is a rare earth metal and possesses unique properties, besides it is not enough. The source of demand for BTC - it is not dependent on almost anyone, it is difficult to obtain, to send it from one user to another do not need intermediaries. If you remove these values from the dollar, gold or bitcoin, the demand for these things will immediately fall.