Did you do any market research? You can very easily go to any store and still buy dumb TVs. I don’t know where people get the idea that 100% of tvs are smart tvs, but that is false.
Rtings pretty comprehensively catalogs and reviews mid and high end TVs. The only TV released in the last two years without WiFi or associated smart functionality is a pretty mediocre 49" TCL. While you can certainly still get smaller 1080p TVs without smarts, you shouldn't have to choose between getting a decent size and panel quality or not having a beefy OS built in.
I did. I went to Walmart for their pre-Black Friday sales that start at 6pm, and couldn't find any. Sample size: Easily 500 people in and out of that store per hour, I was there 2 hours.
Walmart represents a store that is easy to go to for much of the US population. That means a good percentage of people in the US are buying TVs at places that don't offer non-smart TVs for sale.