Then you would assume incorrectly.
Besides the 7%'ers. (Sorry couldn't resist), some cable companies (Charter) (who use the feeds as primary) and all the others use the off air feeds for backup, etc. (I am willing to bet that 7% is also awfully low too...)
As a Broadcast Engineer in TV, I can tell you, if we go off the air, it's a big deal, which takes top priority, and if needed we will pay whatever it costs to get it back on the air.
To think they "aren't in a hurry to repair the tower" is simply not true.
And I think the number of over the air viewers are growing. With the amount of content availble on Netflix, Hulu, etc., and the plethora of OTA subs now a days, I am even considering axing cable, and saving $60 a month.
What about sports? I can listen to baseball on the radio, hockey online.
Football is still mainly on the networks (over the air again). NASCAR, I can stream it online.