A dumb question just occurred to me - how the hell is the FCC going to shut down all or part C-band given that the United States isn't the only country in the world that uses it? What if Canada and Mexico, both of which make use of C-band, refuse to go along? Isn't that band allocation an international treaty, and if so, can the FCC unilaterally change it without the cooperation of all the other countries in the hemisphere? Most of those countries don't have nationwide fiber networks that could be used to deliver programming to broadcasters. I'm not even sure parts of Alaska have fiber to all communities, same goes for the northernmost parts of Canada. And the Mexicans probably have no desire to make any concessions to the Trump administration, even if they do have nationwide fiber.
Seems like maybe this could throw a big old monkey wrench into Pai's spectrum grab... or am I missing something?