From the article: SEC officials have declared Bitcoin and Ether to be currencies, as they are decentralized in their management, but have left the door open for others to qualify as securities, especially at the time of their issuance.
So not really. The US needs to evolve to the new world.
If a currency crisis arises and the market is frozen, cryptos will not be on the first lien right to trade for Fed assets (whatever that currency might end up to be) or even continue trading, depending on the decisions of the Fed. Hell, I don't expect the issued currency (cash - which the long tail of people are still using) will have that right...since the Fed board members aren't going to be running around with palettes of cash when buying goods either.