it is a weird flex to argue that Marx didnt understand such a basic concept of capitalism, that almost always results from capitalism. And to bolster that claim by suggesting it would be incomprehensible because its in a modern context, as a means to minimize the input of a Historical figure. By that rationale it's easy to engage in the dismissal of Historical lessons and contexts in the same sense the fascists do. "Eh, old guys are old. What do they know?"
I dont think you're exactly right about the Founding Fathers, they were actively pursuing the preservation of economic hierarchy. The entire purpose of the Federal system, and the Constitution, was to oversee and largely restrain democratic engagement, because the landowners didnt want to be voted out of their wealth, or in the case of the Southern colonies, their slaves (which bolstered their wealth.) Left to their own devices the States would have been far more progressive-populist had the system of "checks and balances" not been installed. This wasnt an entirely terrible idea because it could be argued that these measures prevent States from must choosing to be slave States again, or denying voting rights to minorities (albeit they still do in other ways). Since then expansion and retraction of democracy has happened, and more and more right wing wealthy elites have grown fearful. In reaction to that, they targeted institutional reform to suit their purposes. Hence the Heritage Foundation goons you've encountered.
That said, I agree with the last paragraph. I just dont think systemic collapse is a good thing, and I dont think there is ANY entity in this Country who can overtake the wheel of the ship and correct-course. MAGA will drive it headlong into the proverbial iceberg, laughing all the way and killing/jailing dissidents. There is no Leftist organization even capable of assuming leadership, and any willing to try are likely to be equally insane/authoritarian. I do think something can be made better out of this system, but that takes time, work, strategy, and patience.