A few years back, I recall, Sun Microsystems tried sending software updates through the unused bandwidth available in the vertical blanking period of the standard TV broadcast. It did work but it just never caught on.
And back in the mid 1990's I used to receive the Teletext service, including real-time stock quotes, using an inexpensive PC ISA-bus drop in card with rabbit-ears antenna, that received the signal transmitted through the same TV vertical blanking period. This was years before the advent of the World Wide Web and the rise of online stock trading. That facility worked well also, until the service was canceled due to lack of subscriber revenue.
So transmitting data in one direction worked well before. But two-way communication via TV? I am not so sure about that. But it is certainly worth giving it a try.
I have a friend who lives on the outskirts of Silicon Valley near San Jose, California. And even to this day he can't get broadband service at a reasonable price from any vendor. No cell phone digital service, no cable broadband, no DSL. That is really amazing to me, when considering that Silicon Valley is considered to be the "center of the technology vortex".