A few weeks ago, I was talking to a relatively high-level sports executive about the election, which is to say we were discussing something terrible Donald Trump had said or done. We agreed that Trump was likely to lose. “But he could always still win — even Nate Silver says that,” I remarked. The executive then said something that stunned me, though the more and more I think about it, the more sense it makes. “If Trump wins, or if he refuses to concede, I’m telling you right now: There won’t be any sports for a month,” he said. “Maybe...