The advertising element of 'smart' devices subsidizes their price. You're competing against devices that are both more convenient and cheaper, and whose drawbacks are not immediately apparent to the general consumer, both because there's no requirement to state plainly the implications of the 'smart' technology on privacy and data sharing, and because such drawbacks are more abstract.
How does the supply and demand work if you cant buy any alternative anymore. Its like trying to buy non LED light bulbs.
Nobody tells you about ads and tracking when you buy a TV. Therefore a consumer can be easily fooled.
From what I've seen in IRL stores, there's no interest in dumb TVs. Everyone wants smart TVs, and I haven't seen any new TV that was dumb.
What people are interested in is cheap TVs and the tradeoff they are making is they buy a smart TV that has a lower price because it's subsidized with advertising revenue.
Maybe people want internet connected TVs to attach to streaming services, but I doubt anyone really wants what we are calling "Smart" TVs