I'm going to agree with everyone saying that the current 'OMG It's not x86' crowd don't know what they're talking about it. It's irrelevant. As long as the architecture makes sense and the tools are there, it doesn't matter so much.
Again, the main thing working against Nintendo getting third party support is the simple fact that it'll be a Nintendo system. Years of audience erosion and marching to their own drum means that it's going to be incredibly hard for Nintendo to convince third parties to jump on board, even if the system has competent power.
There's not even a guarantee that those kinds of games will sell on Nintendo systems. Until Kimishima and co. can convince third parties that there's a healthy market for games like COD, BF, Witcher, Destiny, GTA etc, no amount of power is going to sway the big publishers beyond token launch window support. Which is why I, and many other people have said that Nintendo should have been making moves to create similar kinds of software years ago...they just don't seem interested in doing so, despite having a war chest so large that Nintendo fans tout how they can throw multiple failed pieces of hardware into the market and come out unscathed. Why not actually use that war chest properly and start investing in some high quality western studios? Time is running out.