I do not believe Comey 'had it coming' in that he served his country poorly or with negative motives. On the other hand, Comey was on dicey political ground months ago. He went into detail on his Hilary investigation last Summer. He was the source of Election 2016's October Surprise. He made the comment before Congress that it made him slightly nauseous to think he might have had an effect on the 2016 Presidential election. He was allowed to stay in office until he could be questioned in front of Congress. He is not going anywhere other than out of office. The investigation into Russian manipulation of U.S. electoral politics goes on.
The President can reference a document by Deputy Attorney General Rod Rosenstein to justify his action.
Trump has already proved himself a master at diverting attention from important issues.
We need to pay attention to Paul Ryan and what he and his crew are trying to do to health care. We need to pay attention to Trump's flouting of established policy on separating private business interests from the public interests he has sworn to represent. We need to pay attention to getting his tax returns released.
Eyes on the ball, people. Yes, that would be the 'money' ball. It always is.