I think this is mostly good news. They got an experienced and good producer to oversee the mobile games which can only be a good thing. At the same time they letting someone else try their hands on Mario Kart - but just not anyone; they'll of course promote someone else with a ton of experience and skill.
This is good news. Until proven otherwise ^^
I'm on Twitter @DanneSandin!
Furthermore, I think VGChartz should add a "Like"-button.