It may or may not be the right successor, but it's the only one as they claim to be a one system support company now once the stragglers (Wii/WiiU/3DS) die off. I would imagine they'd go as far as many a Switch Mini handheld where the controls don't pop off with a little bit smaller screen for portability sake if anything. Kind of like the old GB Micro which scaled back the GBA.
I skipped Arms and Splatoon as well because I didn't see $60 in value for either game as i'd never take them online. I did want Fate Extella, but then figured out it was a 'warriors' style game so that gets boring to me every time a few hours in so I passed. Cave Story I could get, but other than that it's looking forward into the months for more since Namco costs too much for digital only.
I'm looking at most likely later on RIME (if I don't buy it on GoG first out of spite), Sine Mora, Battle Chasers, Project Octopath, Elder Scrolls, Mario, that NGPC looking Pocket Rumble, and Tiny Barbarian. There's probably something else I'm forgetting, saw some interesting anime inspired stuff up on amazon listings.
N3DS for me is Metroid, and I skipped the River City sequel, Yoshi, and Ever Oasis as I figured the RPG I'd have no time for.