I don't think it will happen for ideological reasons. Despite his lack of respect for the decorum of US democracy, most others have too much respect for it to start putting former leaders in prison.
However, his second term has been a lot different than his first. The first term had mostly just allegations of personal misconduct. The second term has been marked by a much more organized and systematic dismantling of the administrative state in illegal ways, which has been a lot more impactful.
So the "decorum of US democracy" means that a president can murder, rape, pillage and raid, yet should not be put into prison?
I strongly doubt any American top leader will ever go to prison. That's something that gets decided by American top leaders, who are very aware of what happens when you open that Pandora's box: look at countries like Taiwan or South Korea, where it seems like basically any government position ends in a prison cell.