Then it'd be a shame.
I'm almost certain the games will be enhanced ports from the Wii U version, with some extras added. The footage of MK in the reveal video looked like MK8.
Both of these games aren't that old and I think Nintendo will at least use their assets. The Switch will have more games coming faster than Wii U because of all the ports like MK, Smash, Splatoon, probably Mario Maker and Pokken Tournament too. That's 5 games.