We ae heading to a Decade of exclusives. Microsoft is buying game companies, Sony is buying game companies, Nintendo is buying game companies...
Does Nintendo really need to do this? The Switch already has more games that the DS, the DSi and the 3DS combined.
Then again the number of good games is an issue. Will they do quality control?
Will we get a sequel to the Gamecube Luigi's Mansion that doesn't suck? Will we get a Switch version of the Wii Punch Out?
I happen to think that Dark Moon was decent, and LM3 was excellent - the only "sucking" happening is via the PolterGust.
The Switch might or might not have "more games than the DS, DSi and 3DS combined", but as you mentioned, those
actual handhelds have far more excellent games than this thing does. Pokemon games that don't entirely shit on the franchise's quality, including Mystery Dungeon: Red/Blue Rescue Team and Explorers of Time/Darkness/Sky, and Pokemon Ranger; Bravely Default and Second; Ace Attorney series (all main series titles are on the 3DS, and no other platform whatsoever); Professor Layton; a ton of Legend of Zelda games (though only a handful are actually worth playing); Chrono Trigger; Fire Emblem; Super Mario 64 DS and 3D Land; Star Fox 64 DS; and likely a lot more I can't currently think of.
Oh, and those
actual handhelds (except the DSi) also had backwards-compatibility, making them even more convenient.
Honestly, the Switch still sucks - only a tiny selection of worthwhile games. Xenoblade Chronicles: Definitive, Xenoblade Chronicles 2, Luigi's Mansion 3,
arguably Super Mario Odyssey, Pikmin 3 Deluxe, Super Smash Bros. Ultimate for multiplayer (definitely not for singleplayer; go back to Brawl for that).