I like the idea. If not for me already owning the Switch and using it rouhgly 90% as a handheld console, I'd actually consider getting it.
What Nintendo should do is use the 2DS XL as a sort of "handheld lite"/kid friendlier option that can co exist with the Switch and keep it going, at least for a few years of so. The handheld Nintendo team can still contribute to the Switch library, but can also throw the 3DS/2DS line a bone as well. They could also stress Virtual console of the older handheld games for Gameboy/GBC/GBA/DS, while Switch can emphasize the home consoles.
Then you'll essentially have a nice 3-tier system of platforms to prop you up - the more kid-focused, handheld-centric 2DS/3DS that can act as a sort of ultimate handheld hub for Nintendo, the mobile games which can focus on the mass market/"casual" crowd, and the Switch, which is the home console-focused machine that would emphasize more deeper gaming experiences and the core/older gamers (and get the bulk of the games).
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