st0pnsw0p on 11 April 2014
Titanfall only helped the XBOne sell about 150k more above its previous baseline, and that was with tons of hype and bundles and price cuts. I doubt Mario Kart will do much more than that.
Wii U has been selling around 37.5k/week for a while now and there are no notable releases other than Mario Kart (that we know of) until the last quarter, so lets assume it stays the same outside of Mario Kart's influence.
1 million-150k from Mario Kart=850k
850k/(37.5k/week)=22.666 weeks
So it would take Wii U 23 weeks to reach 7 million sales, which that means it should happen around September 13.
