It's not dead, but it's not mainstream either. It's a bit like quidditch - there are a bunch of people interested in it, and they have their own ecosystem, but don't expect the Olympic Committee to be calling anytime soon.

OTOH, the regulators are getting quite serious in recognizing crypto - including reporting requirements and enforcement. The era where it was tiny enough the IRS basically didn't care except for tiny amount of outlier cases is gone.