Now this just needs to happen with other TV networks. For example, I'd love to pay AMC Networks[0], A&E Networks[1], or NBC Universal[2] a nominal monthly fee to access their catalogs on-demand. While it's true that these networks stream some of their current shows online, the players and streaming experience is usually very terrible. That's how I want to the future to be: everything is like Netflix or HBO-sans-cable…
The aggregate of all these fees (plus Netflix, Amazon, etc) will likely approach or exceed the cost of a typical cable subscription.
There's plenty of wiggle room here for HBO, and because it's more a la carte, I could easily drop a couple of things there once I have HBO.
Not sure what they'd charge for standalone HBO yet, but I think it could be as much as $50 a month and I'd still come out ahead (especially if I dropped something). I got rid of comcast a while ago. As I recall, if you get the minimum level of cable service required for HBO plus specific surcharge for HBO and your internet service through them, I think it's was over $120 a year… I know I'm being vague, but that's largely because comcast doesn't really want to make it easy to figure out what things cost, though, and you can play various games (threaten to quit and get a deal that they hope you won't notice when it expires)… but they weasel right back and get you on all kinds of little things, though, so you have to pay close attention to your bill.
Also, every now and then comcast will tell you to return something like a cable box, and then claim you haven't returned it, and send you a letter threatening your credit history if you don't pay for not returning it even though you have, and then ask you why you're quitting. So you have to factor in that extra cost too.