Looking at the predictions thread for the upcoming June NPD it seems like even most ardent Nintendo fans here are resigned to sub-100k sales for the Wii U in June ... so basically the Mario Kart 8 impact was ... err, not so good?
I really loved Nintendo's E3, but that's basically curtains for the Wii U is it not? I mean Mario 3D World, Wii Fit U, Donkey Kong Country, Wii Sports Club, Pikmin 3, Sonic, and now Mario Kart 8 have all come and gone ... if they still can't get over 100k for a month ... I think most if not all hope is lost. Even the GameCube could fairly regularily top 100k in North America even without a new release, if the Wii U can't even do that in the midst of Mario Kart ... that's just shockingly bad.
There's been an improvement in sales in Japan too, but not really anything to get too excited over.
Smash Bros. will help, but honestly if MK8 can't do more than this, then the system is basically done for barring an Amiibo miracle, or Splatoon becoming a new Pokemon like hit. Oh well as long as I gets me some Bayonetta 2, Xenoblade X, and Star Fox U, I'll be relatively pleased with my purchase.