I wouldn't be surprised if the number of people getting OTA broadcasting will begin increasing.
I don't know anyone my age that doesn't watch mostly streamed content, but we all have digital antennas for local broadcast and the important live events.
It is increasing, a lot. There was a recent study that had OTA using households increase from 9% in 2013 to 15% in 2016. Or as one headline put it "almost double".
Added: Here are some numbers not from memory:
* http://www.ooyala.com/videomind/blog/ota-usage-growing-more-...
Added2: OK I found my numbers, which were slightly off. Fixed...
* http://www.providencejournal.com/news/20170127/tv-antenna-ri...
All homes with TVs that receive broadcast, cable, or satellite TV have network television.
I think you probably meant broadcast/OTA television, in which case a survey from 2016 shows that 17% of U.S. TV households rely on "broadcast-only" television reception, and that was an increase from the previous year.
However, that number is disproportionately higher in poor, Black, and Hispanic households. For example, it jumps to 26% for households earning less than $30K/year.