Marble Mania/Marble Madness/Kororinpa please! HD rumble + tilt would be perfect for it.
For new titles: Nintendo Land 2, Crystal Chronicles 2, Custom Robo, Mario Strikers, Mario Baseball, Devil Survivor 3/a grid-based SMT title, a *new* Mario Kart, Viewtiful Joe, a new exclusive VS title (like Tatsunoko vs Capcom, but with a different property OR a 2D fighter from Arc that plays/looks like DBZ Fighterz but with a different property), Final Fantasy Tactics 3, Pocket Fighter, Wolf Within 2/Fables and something from the Zero Escape series. (I'd be cool with a compilation.) I'd also love a Telltale game with a Nintendo Property. If they can do it with Minecraft, they can do it with Zelda or Mario. I also think a Zoo Tycoon style game would work well using the Nintendo Land IP.
For ports: Soul Calibur VI, Fallout 4, any Marvel vs Capcom, a Paper Mario compilation, GameCube/Wii VC (updated with online multiplayer would be cool), Pyre, Danganronpa, Puzzle Fighter, Reigns, Pokemon TCG/Shadowverse, Age of Mythology plz
I'd love to see Smite, Paladins, or some other free to play game come to the Switch - especially if it supports cross play with other consoles. I know there's one MOBA coming, but more never hurt! Hearthstone/Gwent would be cool too.