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.