Honestly, Most of investors buy bitcoin aiming at getting profit not for using as a currency . From consumer side , They don't care much about what kind of currency as long as they can use it easily in their daily life
I think this only happens since bitcoin is not yet totally accepted by the government.But if time comes that mass adoption for bitcoin will take place,then this will give a high chance to make this currency be legalized and accepted by the government.People will start using bitcoin as a currency just like what they did with fiat currencies.