Great quote! But, did “Federal” paper money exist in the US at the time of the revolution? Or maybe they just had private bank notes, or State currencies? When or how, was paper money legalized for the fed.gov, without an Amendment? Or maybe it was ALWAYS legal for the Fed.gov, and it was STATES that were limited to gold and silver coin? What is your thinking on this? Yes, the States have rules on what constitutes legal tender, but does not the Fed.gov also?
No amendment, just a court case, after which printed paper money had the same value as minted coins of gold and silver.
Point is, the “no brainer” does not count with the Supremes, you never know what they will do.
It took a Supremes decision to decide whether or not a tomato is a fruit or vegetable, and botanically, it's clearly a fruit, being the pollinated, seed-containing ovary of the tomato plant, surely a no-brainer, but the Supremes saw it differently.
It's not a slam-dunk they will rule on the side of RKBA as most here understand that right.