I doubt we'll see a criminal prosecution, or even an impeachment. The 'beyond reasonable doubt' requirement for a criminal jury is very risky - it only needs one juror to to have doubts and Trump walks free claiming to have been proven innocent, and if he is convicted he'll bung the system up with appeals and further bolster his claims of a political witch hunt. Either way works for him and his supporters, apologists and enablers. I think the evidential bar for an impeachment is lower, but again both a failure to impeach or successful impeachment can just be spun to prove his point and support his agenda.
That said, a failure to prosecute or impeach would rather look like the Law applies to all c.330 million US citizens except for the most powerful person in the Republican party - an appalling and dangerous precedent to set. One wonders what the combination of an untouchable, infallible Pope in the White House and an untouchable, unelected council of Cardinals in the Supreme Court might achieve in the name of God and American patriotism.