I agree that Coney's firing unleashed a can of worms that can't be contained. Dangerous worms. However, with some of the facts that have come out about Comey, I think there would have been these problems one way or another - Comey clearly was working against President Trump's.  Comey needed to go and the President was right to fire him. But President Trump should have gone about it differently. And then kept his mouth shut about whys & wherefores - the letter written by Asst Attorney General was plenty of info. President Trump's main problems are:
1) he is too open & doesn't calculate how something will sound, how it can be used against him 
2) practically all of Washington, DC and the media is actively trying to sabotage him.