Do we know how long it takes in terms of development to port GameCube or 3DS games in HD?
No matter when the next switch comes out, it won’t be able to rely on recycling the Wii u with two or three exceptions. So I imagine that some of the remasters we talk about a lot these last months will not only be used to wait until the new console but also to feed its release schedule once it is there.
The games catalog of the Wii u has helped a lot the success of the switch, I don’t know if games like luigi’s Mansion 1 and 2, samus returns, kid icarus uprising, f zero gx or a Star Fox gamecube would be able to fill the holes as effectively for the next generation.