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You're describing the blast radius of what was possible in the past assuming that one president was willing to usurp power but only for one term.
In reality, we did go 4 years with a president who wasn't in charge, at least for part of that term, specifically because the public was lied to about his health and some small number of people his the truth. We did not go through 4 years of a presidency after one very much seemed to attempt to take the office despite having lost the election.
In both cases I take huge issue with the intent and the potential outcome. In one case, though, the outcome was real and I lived, for a time, in a presumably democraric society ruled by someone(s) who weren't elected while the one who was elected decreased mentally and physically beyond the ability to rule.
Trump tried to cheat his way to keeping power. Even if you don’t blame him for the violent attempt, it’s well established that he made major efforts before that to change the outcome by more peaceful means that were just as illegitimate.
Playing stupid games within the system means you lose elections and either reform or get replaced. Playing stupid games subverting the system means you don’t have to worry about elections anymore if you succeed. I’m about a million times more concerned about the latter.
I must have misread you last comment. I read this as a comparison implying that Biden wasn't legitimately elected but you just meant it to set up the point.