He could actually be true, once cryptos are widespread and cash is abolished, goverments will be able to monitor all transactions, how much you make, what you buy, where you work, where you travel, how much taxes you have to pay, no more privacy at all, everything will be in the hands of few bankers and oligarchs.
http://www.zerohedge.com/news/2017-10-21/crypto-currency-calm-stormThe soul purpose of bitcoins was to give people financial freedom, so that people can actually handle their earnings and would not have to be dependent on the banks ( third party) to handle it , and people would no longer need to ply according to the banks term and conditions.
According to me no government would ever be able to gain control over bitcoins , the anonymous nature ensures that our identity would be hidden so how can government track our transactions , charge us taxes without knowing our earnings and the amount we hold.
So practically we would be given more privacy by BTC than bank accounts.