You have a good point, the value of any money (even a lot of gold's value) is a social construct, i.e. only what the population makes of it. For that reason, I don't think that crypto is inherently bad, but the fact is that most people trading aren't using it as money (you know, an intermediate good to facilitate trades), they're attempting to use its wildly fluctuating value to make a quick buck. Those types of trades ironically only make it more volatile, and are what made it volatile in the first place, so there's now a vicious cycle. Will crypto ever stabilize? Fuck if I know, I'm not qualified to talk about this, but frankly I think you could say the same about most people in the stock market and especially in crypto. Maybe if a critical mass of people start actually using cryptocurrency as a currency it'll change, but who can say.