This just isn't true. People could stop buying new TVs altogether, we aren't talking about food or blood pressure medication. This is a luxury item. If I had to guess I'd say most people purchased their last TV because it was bigger than their old one which still worked.
I'd also like to bring in another thing: that people don't care that much about this aspect of privacy. They care that their neighbor don't see their naked bodies, but they don't care that their viewing data might end up in a datacenter or whatever. This surveillance is too abstract to be meaningful to the layperson, there's no feedback of it at all, everyone's doing it, and practically nobody got hurt so far.
So a boycott of an entire product category is a hard sell. Not just because of lack of alternatives, but because the incentives are just not there.