Bitcoin has such value because the coin is a director in the entire market. Incredibly a lot of people own bitcoin and for this reason, this coin is the price generator of all coins. Maybe further some kind of coin can replace Bitcoin, but for this, millions of people have to trust in it and buy it. Well, in addition, do not forget that Bitcoin is the creation of Satoshi Nakamoto, whose identity is unknown. Because in the world there are no controls on this coin.