Tvs have a short lifespan, now. People have to replace them like every 5 years on average, I'd guess. I think people have less tvs in their homes, though.
The other part of this is that people brought a lot of tvs up to a couple years ago when there was a decade long stretch of LED back-lit tvs. The problem was that there might be 100 leds back there and a single one going out junked the tvs. They were cheaply fixable, but not easily fixable. Most people wouldn't be able to do it.