My bet right now is nothing happens to anybody at all. At the moment, it's McCabe that's probably going to get away with what he did, the rest later.
The Political Class never prosecutes one of their own. The only exception to this is Democrats prosecuting Republicans, not in the naive name of "Justice", but for purely political reasons. Republicans never prosecute Democrats no matter what they do or how glaring their felonies are. And of course, Democrats will never prosecute a Democrat even if they are caught covered in blood with a smoking gun in their hands.
In terms of how politicians are treated in America, we have "leveled up". America is no longer "like" a banana republic. America 'is' a banana republic. All political prosecutions are political in nature rather than legal. All prosecutions depend on who is in power, who the victim is, and who and how many 'connections' the target has. It has nothing to do with 'law'. It has nothing to do with 'justice'.
Everything with those guys is political mutually assured destruction. Everything is all about CYA at any cost.