The Switch is basically a high-powered tablet with proper gaming controls. I'd love it if it could actually replace "real" tablets. As it is, we're going to have two separate classes of tablets: those that are actually good at gaming (Switch), and those that are good at everything else (iPad, etc.).
That said, it's easy to see why Nintendo's focusing on gaming: it's their core competency, nobody else in the tablet space does serious non-casual gaming well, and it would be a tremendous undertaking to make the Switch into a real iPad competitor.
I would much rather carry a Switch and an iPad rather than something that amounts to an iPad with awful tacked on gaming controls, with the kind of games the iPad is known for.
Multipurpose portable utility computing platforms are all well and good, but in a general sense are a jack of all trades and master of none.
I prefer to read on a kindle. I prefer to type on a laptop. I prefer to watch movies on an iPad. I carry my DS in case I want to game. I also carry a DSLR in case I feel like taking photos.
I can guarantee I get more work done on my laptop on the train than the guy with his iPad, and I take better photos than the guy with his phone out. I like to think I enjoy the gaming I do on the train more than the people playing bejewelled to pass time.
Hmmm, do you have to walk or bike to the train? If you carry that much stuff around, I guess a car would be better. I've been simplifying what I carry around, I can read better on an iPad anyways.
Yes, I need both of those. When I'm commuting, I don't want to carry both a tablet and a game console. I'll choose one that can do what I need (so in this case, an iPad).
That said, it's easy to see why Nintendo's focusing on gaming: it's their core competency, nobody else in the tablet space does serious non-casual gaming well, and it would be a tremendous undertaking to make the Switch into a real iPad competitor.