Look, they could be. But let's be a little realistic here: This is Microsoft.
They've been recycling the same ideas for the better part of a decade now.
A cable box input with an internet overlay... that was called MSN TV and its been out since '95:
http://en.wikipedia.org/wiki/MSN_TV
The Surface name came from a failed Surface Touch Screen table that Microsoft tried launching in 07. It wasn't a terrible idea, they just couldn't market it and and quickly scrapped the project before it ever took off:
http://www.youtube.com/watch?v=SRU3NemA95k
Or how eerily familiar Project Spark is to Microsoft's little remembered Kodu software from years ago:
http://fuse.microsoft.com/projects/kodu
Then there was the original stuff Microsoft just flat out never released because it didn't fiy their "image," like the Courier.
Or how about the fact Microsoft had the option to release an e-ink reader years before the competition only to have it shot down by Gates because it didn't run Windows.
The only X-Factor to my argument is the Kinect. That's been a successes for them and I can't argue against it.
That said, historically, this isn't a company that has tried new things. And if they do, they bail on them VERY quickly. A lot of that has to do with how the company is run:
http://www.forbes.com/sites/frederi...technique-that-cost-microsoft-its-creativity/
That said, I'm happy to be proven wrong over time. I... I just don't see it. I think the HDMI-in is the best they could muster right now.