LogFAQs > #877613727

I think _AdjI_ has pretty much hit the nail on the head. The only other thing to talk about is Nintendo's handheld line, which dominated from the GameBoy right up to the DS. Then smart phones happened with tons of cheap/free games and essentially whittled support for 3DS down to a more hardcore audience.

The 3DS still sold very well (mainly thanks to Pokemon), but Nintendo's days of mobile dominance might also be over, hence their decision to unify console and mobile with the Switch (it was also to avoid having to support two platforms with games which is trickier now that games require so much work and resource to complete). It will be interesting to see what the future holds, so far the Switch seems to be doing very well...