Actually, I'd say DirectTV, Dish, and your local cable company have a lock on that more than Tivo...
I've never understood why so many people want the aTV to have DVR capability, are there that many folks out there pulling TV over the air?
DVR's have limited capacity and you can't move stuff around your network. Of course Apple missed it, people want a DVR, Apple want 0.99c every time they view something. I love Apple but they are getting greedy, they want money every time you watch something, which is why they wont support BD in OSX or the Mini. The Mini would make the ideal MPC if it had a BD drive ... not happening and it sucks.