Sure but MK8 would've hit a million on it's own eventually anyway. It's 700k now, still doing 3-4k weekly, has key DLC promo opportunities and has it's first holiday season still ahead of it. Even without the bundle I think it'd have been somewhere near 850-900k by year's end.I think it could well be the first (and maybe only one?) game to reach 1m without a bundle, in Japan.
NSMBU wouldn't have crossed a million without bundling though.