It course I would love to see this. I think Nintendo makes some very good games but have no interest in having specific physical hardware do end up not playing them.
There current lineup of mobile games are Mario Kart Tour, Animal Crossing Pocket Camp, Fire Emblem Heroes, Super Mario Run, and Pikmin Bloom. These have brought in over $1B in revenue, mostly from Fire Emblem.
Additionally, Nintendo is heavily involved in The Pokémon Company, so they saw the closed doors numbers of Pokemon Go.
I don't think it's crazy to think Nintendo will have a major presence outside of its own hardware in the future. Nintendo as a company always feels about two bad console cycles away from ruin. This feels doubly true with them putting handheld and console gaming into the same basket with Switch.
I also don't think it's crazy for Nintendo to decide that they can sell more games if they sell them on other platforms. In many ways the whole concept of a console exclusive is legacy thinking when the consoles had major architectural differences and porting was a major process.
Wine is not an emulator, and has nothing to do with projects as Yuzu, Dolphin, PCSX2 and others.
(if running out on ARM, there is still ARM to x86 emulation but that is just generic ARM to x86 emulation which has not that much to do with Yuzo per se)
Wine/Proton is a community implementation of the Windows APIs for Linux, it uses no Microsoft code nor needs any. It runs binaries that Valve already has permission to distribute (the games).
Lolol
other games are only as much of interest as it might be games which could end up on steam or games which show some issue with the emulation which could be used to improve proton
there is also the thing that proton or wine just barely count as emulation, they are a bit of emulation but mostly just providing compatible OS interfaces adaption (through Yuzu might but be that much different given how "mainstream" (but old) the switch hardware is)