When I contrast this with the end of Bubble 1.0, the biggest difference I see is the lack of actual use. 2000 was an incredible bear market, especially in tech. Even good startups died, and the ones who weren't creating value died quickly. The Internet, though, still had hundreds of millions of daily users. Things like email and the web browser and downloadable MP3s made people's lives better, and they weren't giving them up.
But who uses Bitcoin for anything but speculation and maybe some light financial crime? As best I can tell, approximately nobody. The NYT tried using it for daily life back in April and it was a bust. [1] The few major online retailers who offered to sell you things in it have removed it again. Even major Bitcoin proponents admitted it was terrible as a currency.[2] And as far as I can tell, none of the zillion other coins have significant real-world use either.
I think there's truly nothing to sustain an "industry" here. Valuations are going to drop to (and probably below) whatever can be justified by cash flows, which in turn is based on economic utility to people outside the bubble. If that number isn't zero, it's at least very, very small. So as you say, this is only the beginning of the end.
[1] https://www.nytimes.com/2018/04/16/nyregion/new-york-today-l...
[2] e.g., https://avc.com/2017/08/store-of-value-vs-payment-system/