Searches are probably underway now, to identify the underlings that will take the fall.
Nixon didn't go to prison. Halderman, Erlichman, Dean, Segretti etc. did.
Likewise Oliver North took the fall for Iran-Contra.
FWIW I do not see any Republican electoral advantage coming from this. The sole exception might be Trump, who can justifiably claim he was correct from the start, about crooked Hillary.
In typical form, Obama will claim "I dint know nuffin," "but even if I did, it would be racist to go after me."