That would be a really expensive console. How would you even play some Wii games on the go if they involve motion controls, some that you’d need to point at the screen to work? Plus playing ds games on the switch would suck. Want to know why? Just check out final fantasy crystal chronicles echoes of time on Wii. It’s a direct port, no changes or anything, of a ds game. The two screens on one screen that are very hard to see since it doesn’t take up a lot of space on the screen and the touch screen is also hard to use which you use by pointing and clicking. It’s one of the worst experiences I ever had. It’d be something similar with ds games on the switch. It just wouldn’t work. Same with Wii U games.