It's in it's infancy. In two decades we will know what it means to us as mankind. Cars were also dangerous, unregulated, expensive and excessively polluting. It got a lot better on all these points, and not all due to the cars: some of it was a mind shift that mankind had to make. Same will hold true for cryptocurrency.
This is not theoretical. This is happening. Its destroying any service which dares to offer free tiers of generic compute. Its had a significant impact on a global silicon shortage the likes of which we've never seen, impacting products from graphics cards and work computers to cars and defense hardware.
That's it; there's no other correct opinion, only incorrect ones. If you support cryptocurrency, you support the environmental collapse of our planet. We don't need it; its die-hard supporters are either profit-motivated or have nothing beyond a grade-school understanding of historical macroeconomic trends and the broad, undeniably negative impact immutable currencies like Gold & Silver had on the average person's standard of living during economic downturns.