One cannot help from smiling at the solemn invocation of the credit rating of publicly-issued bonds as a measure of governmental excellence, as if either author had a faint clue what he is talking about. That isn't the purpose of the Constitution. The measure there, and it has been from the very beginning, is the protection of the liberty of the individual citizen. The "inefficiency" inherent in checks and balances was placed there deliberately for that purpose. This isn't complicated, it used to be a part of grade-school curricula before the emphasis was shifted toward the ability of five-year-olds to put a condom on a banana.
However, the Constitution was also designed - Article V - to be subject to modification should political geniuses such as Zakaria and the author manage to convince a supermajority of their fellow citizens to agree to dispense with this outdated piece of parchment. However bleak my personal view is of the march of ignorance within American society, we're not that dumb yet, thank God.
The author proved the Framers were correct; our Constitution is only fit for a virtuous people. It is unfit for him and his fellow monkeys. They are surely fit for the despotism we are headed for.