The American constitution fails to protect the country from "a trump"

[Mister Ed]

6. Of course, you could also amend the Constitution without a convention.

A constitutional convention, in which the entire Constitution would be up for revision or replacement, would almost certainly be the disaster you envision. The result would probably be a new constitution, enshrining and institutionalizing fascism and plutocracy.

Far better to simply put forth proposals for single amendments. But, like the OP, I see little chance of even the most reasonable and popular sort of amendment actually being passed and ratified. After all, the proposed Equal Rights Amendment, which very modestly proposes that women should have all legal rights apportioned to men, has languished for generations now.