Trust me, they could find some show to cancel.
There are TV shows on now that have lower ratings than the taxi dispatchers’ radio calls.
Detroit Lions v. Houston Texans?
Cleveland Browns v. Fresno State Teachers College?
Hey! The Texans went 8-8, defeated the Titans, beat the Packers in Green Bay and knocked the Bears out of the playoffs.
I'm sure there's a better example for a low-ratings Lions opponent. ;-)