The United States will always be able to service its debt. There is literally nothing stopping them outside of an arbitrary debt ceiling. The Fed can also purchase treasuries whenever necessary and by law, it pays profits back to the Treasury.
You end the article saying we need to raise revenues and cut entitlements. This is the incorrect approach. It’s these type of austerity policies that slowed the last recovery. Sure, we can implement higher taxes on the wealthiest too tackle other problems within the economy such as wealth and income inequality but cutting social programs has serious negative consequences for the poor and working class.
We need massive government spending and action to get us out of this. We should be rebuilding all of our infrastructure, providing jobs to those who need one, and overhauling our health care system. We need to build an economy with a stronger base and your austerity approach has the opposite effect.