Considering Smash and Mario will launch closer to the holiday season, and Wii supply has never been consistent nor met demand, it will be basically impossible to judge how much of an increase is thanks to Smash or Mario.
Nintendo will probably ship more Wiis to America for the Metroid launch, and see a spike in sales. Aside from Madden, I think Metroid could be the top game on any platform for the month of August, at least for first-week numbers (Brain Age 2 will likely be bigger in the long run). Unless Guitar Hero III comes in August...? I have no idea if Too Human will sell well, but it looks like that is the other big August game.
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.