I think because the price of bitcoin is like a rollercoaster ride, it couldn't happen that it will be stable. In how many years that it is created in this world.
I think there will always be some people who are afraid to buy and use bitcoin because the values of bitcoin are too volatility for them, they could purchase bitcoin at the rate of $3600 USD per bitcoin with their fiat money, but once the values of bitcoin starts to drop to $3400 USD per bitcoin, some people might not be able to accept this price loss within a short period of time.
maybe it could be what makes some people afraid to use bitcoin, the price of bitcoin is indeed very difficult for us to be able to predict the price, and the price of bitcoin can change very quickly, even many people fear that the price of bitcoin will suddenly change lowering the price, of course that's where they were very afraid of losing some of their estimated assets.