This is the "goal" in the long run.
The truth is, the cablebox integration is actually aimed for the purpose of legacy support. TV over the internet is the goal in the future.
There have been many factors in the past stopping this movement.
Speed and bandwidth of internet service has always been a big one. We are approaching a point where these limitations are growing less relevant.
The second big problem is the device. What device can cable providers use that gives them all of the functionality the current cable boxes do?
- Until now, the only real device solution was a PC. But there's a reason why the PC never caught on. Security.
- Feeding TV data to a PC is just begging for massive piracy. There's a reason why Windows Media Center became the Computer Live TV solution. It provided the security cable companies demanded. It had custom encryption methods for DVR content that can restrict content to a finite number of views, or a finite length of time.
The Xbox One offers the flexibility and power (Windows Kernel), the security (locked down operating system), the scalability (Any cable provider can utilize this and program it to work with their system), and the simplicity that no device has ever offered before in the same package. Until now, there was always compromise somewhere. The closest success was Windows Media Center, but do your research and you'll find that it only worked with very specific cable providers.
Finally, a system that ANY cable provider can utilize, and a system that EVERY consumer can use with ease.
Comcast and Verizon made apps for Xbox 360 that did everything the system would let them do. They went as far as the system would let them go.
With Xbox One, they can now do a lot more. Expect entirely new experiences from these large cable providers, with extremely immersive apps/system integration.