when bitcoin have such stable prices, it could be legalized by any country to make it tradeable/ exchangeable for payment tool. because it is convenient to have stable prices if bitcoin want to be legalized. that's what i thought of

I think that if bitcoin had a stable price no one would be interested in it because then it would almost be the same as dollars but you can't buy a lot of things with it. So it think that not so many people would be interested in it.