You're arguing semantics. If the cinemas all die out, because everyone's renting movies at Redbox or Amazon Prime or using Netflix and watching movies at home,

You're arguing semantics. If the cinemas all die out, because everyone's renting movies at Redbox or Amazon Prime or using Netflix and watching movies at home, are you going to argue with someone who says "Movies have died!"? If you do, then you're being pedantic and annoying, because they're right: the cinemas in that scenario have died. The format of a ~2-hour story in video hasn't died, but the tradition of going to a business, open to the public, to watch it on a large screen in a room full of strangers has. Same goes here: when someone says "TV is dead", they mean watching ~50-minute video episodes through an antenna, or from a cable TV provider, with commercials interleaved. That format is dying out.