It's time someone made this thread. I am calling it now before MK 8 releases!
I think we can conclude with recent sales that Nintendo franchises have lost the power they used to have. 3D and 2D Mario aren't selling like before and even Donkey was hit by it. Even Pokemon is down from previous games... Nintendo as a whole is losing money, things sure look pretty bad for them! So before we get our hopes up for nothing I'll crush your expectations.
Mario Kart 8 will have a terrible first week. Don't be surprised if it hits less than 150k globally on it's first week in the market. I also expect it to give no boost to the Wii U at all. Well maybe a very small boost, like 3k or something like that.
Now what about the Vita? I am calling it too. The Vita is currently experiencing solid numbers in Japan, barely droping week on week! Europe is showing promising numbers too. The only place where the Vita need to stablish a footing is on the US, and I expect Sony this year to finally breath life on the struggling console. I expect them to announce a big IP for the Vita in E3 followed by a Vita price cut. I expect the system to rebound this year. If everything goes well the Vita will have a really good 2015. As the Vita grows, the 3DS will be on decline so I expect the Vita to start shrinking the gap with the 3DS.
Also as the Vita is a very modern piece of technology I expect it to be supported for a long time so I think the Vita has a good chance of outselling the 3DS in the end. Yes the Vita will rise!
Oh I was going to add Super Smash Bros in the OP but I think I dragged for too long. But if I had to guess that game will flop too.
"I've Underestimated the Horse Power from Mario Kart 8, I'll Never Doubt the WiiU's Engine Again"