The Constitution took centuries to be effectively subverted. Like, it was really lightning in a bottle in terms of how well it worked. Not Lincoln, FDR, or even the Civil Rights overthrow could by themselves destroy it, but all these blows at once, combined with the increasing immorality of the populace, and the merger of state and corporate power.
We may mock them now-but conservatives and libertarians worshipped the Constitution precisely because it endured so well, it cast a shining light, a beacon in ever more degenerate times, and so the naive belief that just "going back" to it would solve problems can be forgiven.
The Founding Fathers themselves could never have predicted the consequences of mass immigration(especially from the Shtetls more than a century later), or the lasting problems a black population not deported caused. Or the fruits of urbanization had on the spirit of the people(Jefferson knew).
I think if they were alive today, they'd tell us to let old documents die, and rise to forge a new path in our current circumstances as opposed to worshipping either them or their writings.