They tried that more mature demographic with the Gamecube and it failed in sales. Like the GC, Nintendo tried to target the same demographic as Sony and M$, but now they're really playing up that portable aspect, which IMO is Nintendo's wheelhouse aside from family-oriented servicing. I hope this doesn't turn out the same as the GC though, 'cause I'd love to see a more mature trend from Ninty.
I am slightly leaning towards getting one only because I like the dock-able idea, and I didn't get a WiiU because I didn't like the design of it. I'd like to see the hardware specs of this and what the output is capable of, but normally software almost always drives my decision to buy a new console, so we'll see what launch titles they announce for the Switch. I might just do what I do with most consoles and wait a year before committing.