The Democrats aren't going to impeach Trump; there's not enough time and they don't need to. They can simply take down every person around him, leaving him vulnerable and isolated.
I don't think Trump should go to prison, and I don't think he should be executed. Instead, I think he should be committed to an asylum because it is more important to discredit him and the ideology that found itself attached to him, than it is to punish Trump. He's a narcissist who will consider himself a political prisoner if he's locked in a cell. But if he's committed, then he's sedated and medicated, and then the man carrying the Conservative banner can be diminished but more importantly, so will the ideology that fixed itself to him.
That's what is most important; you can't shame the shameless, but you can fucking discredit them.
Most of his supporters are mentally disturbed anyway...committing Trump to an asylum would be a fitting end.