How would they do that? Like in GB where you have to pay a per-tv tax?
I think it is more likely that as the broadcasters are gobbled up by the cable operators, they will decide to shut-down OTA to eliminate all the "freeloaders" who are cutting the cord. Oh, wait, that would be in Canada where all the broadcasters (except CBC and some PBS) are already owned by the cable companies (or the phone company) and you said FCC.
Okay, I think the above will happen in Canada, and then the U.S. cable companies will see how it kept the monopolies in power up here, so they follow suit.