There are many people especially in Europe/USA that don't play handheld devices at all.
Why should Nintendo force them to buy a system that is both portable and for tv.
It should increase the price point highly.
People that buy home consoles >< People that buy handheld.
this has been stated multiple times, it wont be one device that acts as both a handheld and console, there will be seperate devices with the same architecture and similar specs that can share the same software library.
When the herd loses its way, the shepard must kill the bull that leads them astray.