I only watch HBO through my Xbox and iPad (and hopefully someday my Apple TV). The experience is orders of magnitude better than dealing with Comcast's horrific set top box UI.
While there are plenty of people who don't have a console, tablet or a streaming set-top, seemingly everyone has a smartphone. A smartphone which presents an easy, smooth and and generally painless way to consume content on-demand.
These devices are putting perspective to the horrible experience offered by the archaic Motorola set-tops and broadcast model that most cable consumers suffer through. Google is smart to dump that business [1].
I can't wait until I can switch over entirely...