I would think a lot of people would use Netflix as a replacement for D*, as its prices get out of hand.
Netflix streaming has no mainstream movies of any note. And TV shows are from already-released box sets if I'm not mistaken so you're about a year behind on most shows.
A lot of HBO and Showtime shows are only available in SD when I checked Netflix streaming.
Seriously, I don't get the hype about it. They've obviously cut a lot of deals with hardware manufacturers and they say it's their future. But studios aren't going to give away their content for an all-you-can-eat $9/month plan. That would undercut DVD sales, DVD rentals, PPV, etc.