To their credit, the Founders were deep into unknown territory. The common European prediction was that the US would fail and come crawling back to the English Monarchy because they sincerely believed that most people were too fucking stupid to take care of themselves. Notice that the Russians, once free of Soviet totalitarianism, ended up crawling back to being taken care of by a dictator.
In the 21st Century, both the Democratic and Republican parties have replaced the Euro Monarchists.
Not entirely, individuals as Voltaire and others who laid out the script had been popular for decades, and what they pulled off was gutsy, the biggest part is them actually writing it all down, spelling out the actual roles, rules, and obligations. Most viewed it as a gamble, actually represented a threat, but I wouldn’t say many felt they would return to the English, but rather evolve into some form of semi-absolutism
And politicians today, because of those recorded rules and regulations, can’t become monarchists, perhaps part of an oligarchy, but not totalitarianists, although, we do have one that is attempting such even today