Trump’s threats to NBC’s “license” displayed three of his worst traits: his thin skin; his contempt for constitutional norms; and his ignorance of the fact that the FCC doesn’t license networks. That’s about par for the course, I guess.
It is generally assumed at this point that Trump will remain all bark and no bite with the media. That’s not necessarily true. Wait until you see his reaction to a war or a big terrorist attack before you reach that conclusion.