The 3DS May Not Die For a While, but...
In an interview with TIME, Reggie Fils-Aime of NoA implied that the 3DS will continue alongside the Switch as a product marketed at younger consumers that want their own personal console. While the 3DS has always been seen as something geared toward a younger audience what with its plethora of family friendly games, this may imply that future games may or may not have the older consumer in mind.
Source
Reggie to TIME said:The Nintendo Switch, being a system that’s been in the marketplace now only seven months, certainly that’s a system that our teams will continue to develop for and bring fantastic new experiences. We have to do that to keep driving that platform forward. We view the 3DS as a very important part of our lineup, but really targeted against a different consumer. That product is really focused against new consumers in the Nintendo family, [such as] five, six, seven or 10-year olds [who want] their own dedicated system. And a system [on which] they can play all of these great games. So it’s going to have a different focus: entry consumers and consumers looking for a little bit more value.
So that’s how they’re differentiated. There will be new games for the 3DS line, so we’re not in any way stopping our activity for that platform. But it’s just focused on a different type of consumer.
Source