Yes, I do foresee the end of "$10 a month for unlimited downloads", but I think programs like iTunes will be fine. Maybe some bands will offer downloads straight off their websites. (I think Coldplay already did this, and what about U2? I do remember it was some current alternative group, though.)
Digital antenna? What about HBO and Cinemax? ESPN? CNN? OTOH, you don't NEED a cable box in every room. No one ever said you did. Stick the cable straight between the wall and TV. You'll save at least $8 per month per box and you'll still end up with approximately 70 channels on those TVs.