Mobile haven't killed handhelds, just moved away the crowd who were never console gamers in first place. That's why there is no demand for games like Nintendogs and Brain Age on Switch, you can find 90 different better versions of those games on Google Play and Apple Store without spending 300 USD in another device
Switch is just a good enough system to convince people it's a worthwhile purchase to play games. It has attract Sony consumers, Xbox consumers, PC gamers, Nintendo's gamers and even non-console/PC gamers. For most gamers it's completely pointless to have Playstation, Xbox and PCs in the same generation when almost all the best selling games are shared but completely acceptable to have one of them plus a Switch
And in Asia seems like makes sense to ONLY have a Switch as they don't even care for the best selling third parties existing in Playstation or Xbox
