A lot of people compared to the market value of the dollar, so even if they came out, one bitcoin was worth $20,000, $100,000. Many people think that a good currency should not be a big flop. A widely used currency should not rise and fall. The problem, however, is that bitcoin is not mature at this stage. Conversely, assuming that the current price does not rise and fall, how many people will rush into the exchanges?
You are choosing the US dollar as an example of what a currency should be but if I remember correctly the US dollar has been crashing for a long time in the last 100 years it has lost 98% of its purchasing value, and yet people use that currency, it is true that the variations in the price of bitcoin are more abrupt, for example bitcoin lost about 70% of its value just in the recent crash, and that was just in a few months but that statistic is very deceiving because it left out that bitcoin went up almost 2000% in a year something that the dollar will never do.