I believe he is right and wrong. I see potential huge collapses in the future due to [1] and many people who don't believe in CryptoCurrencies and only invest for their portfolios will see huge loses. I can imagine some crashes taking years to recover.

However in the long term I see CryptoCurrency as the future and a viable store of value. I think Buffett is right to warn investors not to invest. Only invest if you understand and believe in these technologies.

I sort of cringe with family and friends getting too deep into it because of the historic rate of return.

I'm the sort of person that will hold their coins even if we go to $0.

[1] - A major Government feeling threatened in several years due to a handful of CryptoCurrencies really screwing them over. (See Zerocoin for tax haven, Bitcoin for smashing into value of USD, Ethereum for immortal web servers) declaring that all these currencies and the systems running on top of them (file sharing servers, child porn, unbreakable messaging, etc..) are now illegal.

I think the only reason they will prevail is that the countries that continue to embrace these technologies will benefit from them and become stronger. Eventually the countries that banned them may have to unban them to remain relevant.