There are still people who do leave the television on constantly.
Far worse, there are many, many, many public spaces --- waiting rooms, bars, restaurants, cafes --- in which televisions are ominipresent and, again, always on.
This has become far worse, rather than better, with thinner and cheaper displays.
That's considerably more prevalent in the US.
I choose my bar and restaurants by the abscence of large screens. ( Not only obviousely but if it can be avoided, I do )
Far worse, there are many, many, many public spaces --- waiting rooms, bars, restaurants, cafes --- in which televisions are ominipresent and, again, always on.
This has become far worse, rather than better, with thinner and cheaper displays.