Throwing Trump under the bus and persecuting him is a very risky move, so I don't think this will happen. Don't forget that he still has ~75 million votes, and his loyal right-wing fans could snap.
Anyway, I think previous leaders also have some kind of immunity since I can't remember when last time we sue previous leaders because of their crimes.
No previous leader has come anywhere close to the line Trump has crossed with the possible exception being Spiro Agnew (Nixons VP).
You can call it persecution, but it has nothing to do with his political beliefs and everything to do with deterring future Presidents from abusing their power.