Makes me more and more glad that I never let my TV on any network and only use it as a display for Apple TV, the Blu-Ray player, and playing media from USB drives...
My LG TV has been offline for the past 2 years (since I got it). I'm so much happier using the Apple TV. I know people want "dumb" displays, but the reality is that these OLED panels offer industry-leading image quality and benefit from economies of scale, where most users want some form of built-in OS. A signage board cannot compete on price or quality. As long as TV manufacturers let me run it offline without issue…
Those aren't the only two options. There are commerical TVs (eg in hotels) that are very close to standard TVs, but with a minimal interface.