I suspect this is definitely something they'll be doing - we've seen them gradually lean more on titles from previous systems (not just Wii U ports) as the Switch marches on, and I don't expect that to stop. Obviously, we've got the Advance Wars Reboot Camp parked in 2022 already (not GC/Wii, but same era as GC) and it seems pretty clear Metroid Prime HD is set for 2022, too. I'd assume Switch gets Wind Waker HD and Twilight Princess HD at some point, but it'd obviously be more fun to get HD versions of games which haven't been remastered yet.
The one I really want is F Zero GX, so that Nintendo could test the waters for a new entry in the franchise. But then there's also things like The Last Story and Eternal Darkness which I think would find appreciative audiences on Switch. I also really, really want MGS: Twin Snakes to get a HD remaster, but that may be a little more complicated.