Since the point of broadcast TV is to show ads, that 71% is the whole audience to broadcast (minus anyone outside the 18-49 age group of course).
Whoever they are, they're not the same people as those who are likely to hang around TrekBBS. Broadcast TV is being made for Not Us. Which I guess explains why I've given up on it entirely.
Anyway, Verizon isn't going to pass the savings on to their customers, they're in it for themselves. Anyone who wants to reduce their bill via a la carte pricing already has the Netflix option. Works great (assuming your country has Netflix by now.)