Part of the logic here is that Trump is indeed different from other authoritarians. He's even less competent. He's blowing all his political capital on imploding the economy. He also can't understand the legal battles, so when Stephen Miller tells him they won the Supreme Court case 9-0, he believes him. This seems to have been a big wake-up call to Gorsuch, Coney-Barrett and Kavanaugh. The administration has shown its hand much too quickly, before it fully consolidated its power.
What the Democrats should be doing already is campaigning more. Run ads that are literally just Trump quotes. Show people Trump calling January the "Trump economy" before inauguration, then calling April the "Biden economy" now that he's crashed it. If Trump polls low enough, more senators will jump ship, and impeachment could be possible.