The case where the precedent was set suggests that it is within the outer perimeter of what the President does to give a speech designed to whip up a crowd before they head them off to the Capitol to attempt a coup.

While Trump may go farther than that, it is hard to imagine any other President in our history who would have considered doing anything more deserving of criminal prosecution in a US court.

Given how polarized our country has become and the requirement for a 2/3 majority in the Senate, it is also difficult to see how we could ever again wind up in a situation where the threat of impeachment is a significant concern to a sitting President. Given the current state of the Republican party, I'm not even sure whether an attempted military coup by Trump would get that result.