I've only seen 3 seasons (only ones available on netflix), but feel I have seen roughly 20 episodes directly relating to the Mike / Harvard thing.
Forget which episode/season it was (blends together), and 95% of the episodes I've seen where they bring up this issue, they have done so in a very egocentric focus "Oh no, what happens to Mike!", however, I do recall a larger chain being brought up at one point. It was regarding the liability of any case he is involved in.
IE: They do case, lose $40 mil for a client, Mike is somewhat involved. Information about his "fraud" is released, client sues company. Company denies knowledge of Mike, says he was hired in good faith, pushes claim towards him.
Also, if he isn't a court appointed lawyer, but acted as one, wouldn't that case, no matter the ruling, be open for a retrial? Bad counsel is one thing, but fraudulent is an entirely different thing.
That said, happy to hear that they have busted him, sad to hear I still have a season and a half left with it. As others have mentioned, this show shines when they just let it go and focus on the lawyering. Boston Legal had the same thing. The two bros lawyering it up was great, the drama storylines, not so much.