Since we're getting ports of everything else, I would not mind Donkey Kong Country Returns and Donkey Kong Country: Tropical Freeze ported to the Switch.
Maybe they could use the Tropical Freeze assets to re-do the DKCR graphics and then slap them onto one cart.
I think this would probably sell better than something like a Xenoblade X port also. Tropical Freeze was really hurt by being on the Wii U and deserved better sales. Also having a version without DKC TF's horrendous loading times would be nice.