I'm still using a 50" 1080p (plasma!) television in my living room. It's close to 15 years old now. I've seen newer and bigger TVs many times at my friends house, but it's just not better enough that I can be bothered to upgrade.
Doesn't plasma have deep blacks and color reproduction similar to OLED? They're still very good displays, and being 15 years old means it probably pre-dates the SmartTV era.