It's nothing specific to Nintendo, but I think making a unified portable & console platform would be a huge mistake.
It's a universal mistake among engineering companies. Unifying platforms and systems, almost never works out. Everybody thinks hey, rather than support both System A and System B, let's make System C which unifies them.
More often than not, this ends up as C not really replacing A & B completely, thereby C adds complexity overall, and the company has to divide it's resources supporting all three A, B, C.








