I would love for Nintendo to make adapters for all their controllers to join the current GameCube adapter, especially if they add games from SNES and onward as part of the Switch Online service. Still having my original controllers, I would love to be able to use them. I know they sell an NES controller exclusively for Switch Online subscribers, but I would rather use my originals. In a perfect world, they'd create a controller hub, which would have inputs for NES/SNES/N64/GC.