The former chairman of the Federal Election Commission says: "Michael Cohen Pled Guilty to Something That Is Not a Crime." In significant detail, he notes the campaign finance "violation" that Cohen said he was guilty of has no standing in the law.
I noted that Cohen was forced to pay a $1 million fine. The guy is worth $20 million after a lifetime of tax evasion and taxi cabs. To hold on to the 95% of his fortune, I would bet he would sign off on whatever the SDNY asked.
Extra - Alan Dershowitz and Dan Backer have pretty much said the same thing.