I think it's difficult to argue that Bitcoin hasn't failed - perhaps not completely (as in total collapse), but it's certainly not been the financial revolution that it was proclaimed to be a couple of years ago - shortly before the price tanked and it's not recovered.

I say this as someone who had an incredibly interesting year a few years ago, getting into mining bitcoin and other crypto, and who holds what was at one point a few thousand £ of bitcoin. I still hold the same about, but clearly worth a fraction of that amount, but I'm not expecting the peak value to be reached in the near future.

The technology has shown itself to be viable (with sensible changes made), but bitcoin is tainted in the mind of the public as tied forever with organised crime, drug dealing and purchasing of illegal goods anonymously. I could be wrong (I hope I am!), but I think while the technology will survive, bitcoin itself is looking sadly dead in the water.