The founders were quite clear that in the end, the only power that could stop usurpers is the people themselves.
"What is to be the consequence, in case the Congress shall misconstrue this part [the necessary and proper clause] of the Constitution and exercise powers not warranted by its true meaning, I answer the same as if they should misconstrue or enlarge any other power vested in them ... the success of the usurpation will depend on the executive and judiciary departments, which are to expound and give effect to the legislative acts; and in a last resort a remedy must be obtained from the people, who can by the elections of more faithful representatives, annul the acts of the usurpers."-- James Madison, Federalist No. 44, 1788
By the elections of more faithful representatives...
Well fine, but how does that achieve the desired end. Unless the impeachment power were used vastly more than it is today, not in theory impossible, but imagine the manpower needed even if Congress suddenly wanted to do this. They’d be doing nothing BUT impeaching.
Not trying to be gratuitously difficult, just trying to channel thinking in some effective direction.