It will get AT LEAST a million sales bump in the couple of months following MK8's release. Which is why it's so important that Nintendo KEEP the momentum going from there, with a steady release slate after that, and why they also absolutely NEED to get Smash Bros. out on Wii U this year. The 3DS version does not even need to exist, and it's very existence will absolutely cut into potential Wii U sales that could have been had, from people who wanted to play the new Smash Bros., and had to finally buy a Wii U to do that. Now, many people who already have a 3DS, will just get it on 3DS, even though the graphics are barely on par with Melee, and it's going to have more limited content all around.
I think SB on Wii U will still sell pretty well. But having it as a Wii U exclusive should have been a no-brainer to Nintendo. Those are the kinds of exclusives that drive your console. It'll STILL have a big impact. But the 3DS version will absolutely eat into that, to some degree at least.
But yes, I think it'll hit 7 million over the summer, and with a likely MK8 bundle to hit in the fall, that'll only help drive sales further. It'll be at at LEAST 8 million, if not likely more, by the end of this year. Nintendo just needs to quit having major gaps in their release schedule, and they need to advertise the shit out of it, plain and simple.
