There is a lot of difference between gold and bitcoin. Gold is actually backed by a metal which has value because of its easy liquidity in any place in the world and the low reactivity of the metal. Bitcoin on the other hand is actually not backed by anything but a community support. Because people believe in Satoshi's words and that bitcoin can become something big in future, so they buy it and that leads to increase in price of bitcoin. Same goes for altcoins though. Majority does not have any use case except some few rare altcoins that people never talk about.

Whether bitcoin can change an existing system is still speculation but let us hope bullish for future.