But yes, support for the ethernet mode as far as I'm aware was never actually implemented in any devices that reached retail availability.
That could of course change. Could be even a nice feature for connecting your TV to the network via your multi media center, if the bandwidth is good.
https://www.techspot.com/news/113031-lg-alienware-monitors-c...
Proportion of non-HN users whose TVs don't connect to the internet? Negligible
HDMI Ethernet is dead, it's never going to happen in consumer televisions because it has a hard conflict with a feature a lot of people actually use.
But I guess like an xkcd comic, someone is obligated to raise the issue every time TVs come up.