Why Nintendo should stay first party? From a former Sega and especially Sonic fan, this is pretty obvious. We can trace the decline of Sega as a publisher of good games back to when they quit the hardware business and became third party. We can trace the exact game where Sonic started going off the rails to the first main non-remake Sonic game developed for non-Sega consoles i.e. Sonic Heroes. If Nintendo go the same way it will be far more tragic, as they have a number of franchises whose quality it would be awful to see compromised.
It's not just coincidence this, either. First party games are so often superior, and there are many reasons to this. Focus on optimisation for a single console, having cooperation between software developers and hardware developers for a fuller understanding of the hardware, a company having more to lose if they're developing games to try and sell their own console etc. etc.
And that's not to mention the fact that Nintendo are the only ones making interesting hardware, rather than glorified PCs. Take them out and that's pretty much it for me and gaming. I'll become a retro gamer, with a small amount of PC gaming on the side. Sony and Microsoft offer me nothing.











