Things usually feel more remarkable when they're forbidden, especially these kinds of mods. A lot of people would hate to play online with the Wii, considering the amount of cheaters online are off the charts. It was already like that a few years after Mario Kart Wii first came out.
It might be something cool, but if I were using it, the pit of my stomach would still hate it just because of these developers. I've had a grudge with them for quite a while.