If the wealthy donors and corporate interests were smart they'd take a haircut on their wealth to try and stave off this issue but it seems we're mostly in a loot-and-raze craze. Realistically I would sooner expect an American-style French Revolution before we see the rich grow a sense of self-preservation.
A massive return to conservatism that manages to create a capitalist first theocracy loosely following American Calvinist principles (you have money because you are gods chosen, you are poor because you deserve it, for the poor here is this underclass to blame your problems on so that you dont aim your murder at the rich).
They've already been trying to sell some of the Calvanist dogma by trying to soften the blow of tariffs which by all indicators has been a massive failure of a messaging avenue, which is why they've moved towards trying to just ignore it instead.
Many of them will get really mad at whoever the person to blame points the finger at, regardless how plausible. But what good does getting really, really mad do, against a government with a functioning panopticon and an effective monopoly on force?
Until now, there has never been a time in human history when an oppressive government had the technical means to effectively surveil and control the population en masse in an automated fashion. It doesn't help that they have a monopoly on advanced weapons, lethal drones, and armed goons. As George Orwell put it: "If you want a picture of the future, imagine a boot stamping on a human face — forever".
If we genuinely can't sell treasury bonds, even at elevated payouts, we're probably at a point where we will either have to default in the near future. Or maybe intentionally inflating our currency until the debt is serviceable; no idea which is preferable, but would be curious to hear which and why.
In the mean time the impossible, unsustainable, terrifying national debt will be used to justify benefit cuts (like the upcoming privatization/cut of social security when the trust fund runs out in 7 years)