I just sold all my altcoins for BTC on Binance as soon as I saw this and transferred them to gdax. Hopefully I can sell them for USD on gdax and transfer to a real bank before they get hacked.
Also, real money transactions are much more likely than blockchain transactions to be reversible if fraudulent.
Trading between cryptoassets as GP suggests he has done already makes them subject to taxation. The fiat step isn’t needed.