Wasn't there more to this? I can't find the exact quote, but I believe Jobs also said that he doesn't blame people for this because after a hard day of work (etc.) you really want to relax and turn your brain off, and TV is perfect for that - in fact you burn fewer calories watching TV than you do sleeping.

He also said "We don’t think that televisions and personal computers are going to merge. We think basically you watch television to turn your brain off, and you work on your computer when you want to turn your brain on."

Of course he was kind of wrong about televisions and PCs not merging - see youtube, netflix, Apple TV, etc.