In this modern day of trading like usual buy and sell of goods and other form of exchange,fiat or national currency was the standard medium of exchange. Over a period of time as inflation grows the vale of currency gets lower, so bitcoin try solve this anti-inflation circumstances but it failed that's why bitcoin was traded as part of assets or commodity but not an actual currency so far.
All about demand and supply and what makes bitcoin even more special is the deflationary features, so over time, with increase in demand, it is pretty obvious how the space will definitely get to develop and grow in value as well. It is already backed by the value it creates on its own, so it does not have to be backed by anything else.
This is a decentralized currency and every one of us as long as we accept the price we are paying for it, then that is what would always keep making the value to grow stronger. It is necessary to understand that with real life usage, and as store of value, even if the price is $100m to a bitcoin and people see the need to have to use it, they will most definitely do.