And the majority of huge bitcoin investors are traders. So, do you still think that bitcoin will continue to be popular when it has a stable price? How is bitcoin even different from fiat when it has a stable price? Sure there's anonymity feature, low transaction cost, etc. But you also already have that when you're transacting fiat. When you pay with paper fiat, they don't have the logs of that coin to see the people that once held the coin. Transaction cost is even free.
Only ones that will be happy about bitcoin having a stable price are those people that are too coward to try something new like bitcoin and we aren't in need of that type of people.