Not quite the case with television... and we are being increasingly "convenienced to death" by the arrival of on-demand TV shows and movies. Americans continue to gain weight because passive activities are ever more appealing.
i find that because i am so nearnited i don't watch anyway. i listen to the tv. unless there is something i really want to pay attention to like a movie...school or rock for instance. then i sit down and put on the glasses.
otherwise i listen and don't even look at the screen most of the time.
it still requires that you stay in or near athe room tho unlike radio where you can carry it around.
i am still passive tho. most americans are. they drive instead of walking. at least i walk...i have to i can't drive a car.
i think the computer has taken over the tv for lots of us tho. and that is just as passive. at least you do interact with real people on the net.