Sports - that's the ticket. Comcast remains relevant for two reasons in my mind - they provide high-speed Internet in a quasi-monopolistic fashion, and local sports broadcasting. (I live in Philly, the stranglehold on sports here is palpable.) That said, even sports apps are starting to show up on Apple TV and the like - it's just that right now, sports are attached to cable deals, much like HBO Go is attached to cab…
What bothers me is that we'll likely never see an API for all this content. TV software is spectacularly awful. Netflix is merely mediocre, which makes it feel like pure awesome compared to the piss-poor UIs that TV users are familiar with. of course, content wins so the interface is bottom priority. But without an API, there is no way for a 3rd party to provide a better layer over the content.
An open API so that pretty much anyone could subscribe to X channels and mash them together in an app or program to do whatever they wanted. Truly a la carte, like downloading books and being able to pick your eReader or library software.