Would they be able to say the election was rigged if Trump loses by double digits nationally, though? Surely, there has to be a point where they acknowledge their guy lost the election fair and square.
Maybe. I honestly don't know at this point. The profit motive of selling the myth of the election being rigged to Republican base voters who would find such a story comforting is going to be very powerful in the right-wing media, especially given that Trump himself is spreading such theories. Perhaps if he loses by 15 points and Hillary picks up Texas and Mississippi and Utah they may not be able to make such claims, but if we are talking about the roughly 7% margin that looks plausible now, I would absolutely assume that many will go with rigging claims.