No, that successor would not be the Switch. While nothing seems set in stone right now as they put all their efforts into launching the Nintendo Switch and continuing to support the 3DS, the big figure heads at Nintendo are insisting that they may not be done with purely handheld dedicated gaming, stating that the 3DS could indeed see a succors. Nintendo President Tatsumi Kimishima stated as much according to a report by Kyoto Shinbun. We are unsure 100% if this place is reliable, but we do know for certain that Eiji Aonuma’s words are not to be doubted.
Here is what Eiji Aonuma said in an interview with EDGE magazine:
“There’s an element of that, but it doesn’t automatically mean things will happen more quickly or more easily. Plus, Nintendo 3DS still has plenty of titles in development. The concept of the Switch is that you have a home console that you can take with you on the go, and in that respect it is both home console and handheld, but it doesn’t mean for us that the concept of a dedicated handheld will just disappear.”
It seems like the Switch won’t be the end of the road for 3DS, or a possible successor.