A very interesting question, indeed. This was posed by Rich Karpinski, one of the editors of Telephony, recently. He overheard his teenage daughter watching Gossip Girl on her laptop when this question was asked of viewers - and it was apparently a serious one.
Is IPTV, You Tube, Hulu, etc. growing at a rate that could surpass TV very soon? It doesn't seem likely but I've been wrong before. Who watches TV on TV anymore?