I did have a look into Plasma Bigscreen! It looked very cool. I was tempted to just use a Logitech K400 as a "TV remote" with a CEC adapter to make my keyboard control TV volume.
I'm thinking of getting a new TV, but, wow. Modern smart TVs are a privacy joke. I think I'm going to meet in a pragmatic middle: buy a new TV, keep it PERMANENTLY off the network, and then use an Apple TV box.