"cryptocurrency will end very badly" Maybe the oracle was right all along. Guess a guy worth 88 billion knows what he is talking about.
Is it already over?
I've been through this before -- back in 2014 or so. Almost everyone agreed that the Bitcoin bubbled had popped forever and it was destined to be nothing more than a niche currency for geeks. Fast forward to now, the price is 20x higher.
From a long term perspective, Bitcoin continues to grow in adoption and legitimacy by virtually all metrics. Buffet may end up being right, but we're a long ways off from proving it.