I think you will find that even a conviction for incitement, sedition, "rebellion", none of these would legally disqualify him - or anyone else - from running for or holding that office. The Constitution is very clear about the qualifications and what would disqualify a citizen. The ONLY crime for which a conviction would disqualify a citizen from holding the office of POTUS is the Constitutionally defined crime of treason.
Since the two elements of that crime, both require a citizen to engage in fighting against America while it's at war, or lending aid and comfort to the enemy during such a time, it is impossible to convict Trump of that. The only hope for the Left on that count is to convince enough people that he's DQ'd to cause him to lose the election. His rise in campaign contributions and polling demonstrates that this tack isn't working and hasn't from the beginning.
IMO, the Left knows he's likely to win, especially if Biden or Newsome were the nominee so they want a plan B to keep him from being able to harm them once he's inaugurated. They will take this country into a kinetic Civil War before they'll allow him to hold that office again and damage their criminal schemes.