I think the essay makes an interesting point, and I think that there is some validity to it. On the other hand, the author implies that time spent watching TV can (and ultimately will) be turned to other purposes, and I don't necessarily think that this is so. Modern life leaves the average person with a lot of free time, but it also imposes a great deal of stress, much of it highly artificial and hard for us monkeys to deal with. It's one thing to come home at the end of a long day and flip on the TV. It's quite another to come home and do something useful. What I'm saying is that it is true, that modern humans have potentially quite a lot of unscheduled time. But that that surplus time does not necessarily equate to a surplus of cognitive capability or motivation.