What is the point in freeing up the TV when you're in the same room as the TV? Most households by the time this becomes relevant will be able to free the TV regardless by streaming TV to their tablet or laptop. The PS VIta can do this too and that is a really popular and successful platform, it can even free up the TV and you don't even have to be in the same room.
Asymmetrical gameplay has not been proved to be enticing. You can't count these until they are hatched.
I just wanted to say that I personally believe that Asymmetrical gameplay is extremely enticing. Not only can it allow people of different skill levels to play the same game but it can simultaneously satisfy people with different tastes (ZombiU's vs multiplayer is essential RTS vs FPS). I dont think this concept has been fully realized yet (although ZombiU and Rayman Legend's multiplayer does look nice) but it has heaps of potential in my opinion
These things are just additions to the core of a console so not needing to play gamepad only wont negatively affect your experience with the console. Its just something extra for those who can use it. At its essence a console's quality depends on the games. Everything else is just a bonus