I think he probably does not really understand cryptocurrency and how it works. I want to remind you that Warren Buffet is a new person who knows nothing in the world of technology, so what he says has nothing to do with Bitcoin, or cryptocurrency is just an idiot like you would post what idiots like Buffett would say about Bitcoin, and if you can handle the truth then sell your coins and submit this to us.
There are many people who say bitcoin will die soon, bitcoin will crash soon, bitcoin is ponzi scheme, etc. And they say this when bitcoin is only $ 600, $ 400, or even $ 100 or less.
Because the fact is that bitcoin is an innovative technology today. Even if price wise we are not up to the previous altitude, which I think will happen, bitcoin will still serve a certain niche of investors and users well enough that needs decentralization and globalization.