I know Charlequin is only supporting a hypothetical (that is, if Nintendo wanted to run a platform single handedly), but I don't think he has considered all the consequences of these seemingly easy tasks for Nintendo.
The simplest example is Western Developement. Nintendo is -- very deliberately and consciously -- a conservative Japanese company. In conservative Japanese culture, most businesses are fiercely demanding of their employees, expecting them to do what they're told when they're told. The company is then in turn unusually loyal to their employees: they try extremely hard to avoid layoffs, as Sony did in their recent downturn, as an example.
Well, most American employees simply don't think this way. They want more freedom to create what they want, and certainly don't want to be tied to a single company ad infinitum. Of course, they don't like it when they get laid off: look at the massive number of layoffs and dissolutions Microsoft has wrought in their publishing house as an example. Look at EA. Jobs aren't safe even if your department is doing reasonably well. More generally, it is entirely acceptable in American culture for companies to lay off people for "restructuring" or whatever other reason they might choose.
And for the most part it seems most Americans would prefer a shaky, uncertain job future with more freedom to a very secure, safe future where they are rigidly tied to a single company.
All of this is supposed to explain why Nintendo's entire corporate culture and most Western employees are at odds. The way Nintendo runs business -- its very core principles -- are not palatable to most Western developers. And it shows: most of Nintendo's attempts to branch out in to Western development (Silicon Knights, Factor 5) have ended disastrously. So, to attract a larger Western Development group in to Nintendo's first party, I think Nintendo would essentially need to change their business philosophy entirely.
I think that's a very bad idea, and as such I'd strongly recommend that Nintendo make no attempt to create first party Western development at all. Ever. Unless American employees change, I guess. I could imagine small groups of people accepting this type of culture: finding a small studio here or there. But en masse? No, not ever.
But that isn't my real point: my real point was that I don't think Charlequin had thought about all the consequences to these seemingly easy changes Nintendo could make. I think they're far more complicated, and in many cases reach significantly different conclusions. Like the example above.