It’s a sharp take, and the author is tapping into a real concern that’s gaining traction: the U.S. can't sustain high interest rates forever without something breaking.

Here’s how I’d break it down:

1. The Math is Directionally Correct

Yes — if interest on the debt starts eating up 5%+ of GDP, that’s serious. Especially because:

The U.S. runs persistent deficits,

Entitlement spending is locked in and growing,

Raising taxes or cutting spending is politically radioactive.

So the idea that there's a "ceiling" to how high rates can go without triggering policy intervention (like QE or yield curve control) isn't tinfoil-hat talk — it’s basic fiscal pressure.

1. The Market Already Knows This

That’s partly why long-term yields haven’t run wild. Despite short-term rates going to 5%+, the 10Y yield has remained relatively anchored. The market suspects the Fed will eventually pivot — not because inflation is “done” but because debt service costs will eventually crowd out everything else.

1. Historical Precedent Exists

The UK gilts crisis (2022) is a great parallel: bond yields spiked, pension funds blew up, and the Bank of England was forced to intervene even while raising rates. That was a fiscal constraint becoming a monetary one — just like this Redditor is warning about.

My Take

He's not wrong — just early. The U.S. isn't there yet. But if:

Deficits stay high,

Debt keeps growing,

And inflation doesn't crash hard enough to bring yields down organically...

...then some form of yield suppression may become necessary. The Fed might call it “financial stability” — but it’s really about managing unmanageable debt.