Prosecutors will have a tough uphill battle. They'll have to prove three things: 1) that Jan 6th was an insurrection, 2) that Trump participated in that insurrection, and 3) that the 14th amendment applies to the President. I suspect things will not go their way. But it'll be interesting to see how the majority reasons out their decision.
No, I suspect that they might focus on the argument that, somehow, the President is not "an officer of the United States."
Yet, when I read Aticle 2, Section 1 of the Constitution, I find these words, that every President must say before the Chief Justice before taking office: 'Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:- “I do solemnly swear (or affirm) that
I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."
I rather think that John Roberts, who administered that oath, will have a hard time arguing that the guy who promised to "faithfully execute the Office of the President" is not, somehow, an "officer."