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Nintendo’s enemies have arrived by battalions. Angry Birds, Fruit Ninja and other inexpensive, downloadable games, particularly for cellphones and tablets, have invaded its turf. Changing tastes and technology have called into question the economics of traditional game consoles, whether from Nintendo or Microsoft, maker of the Xbox. Nintendo recently posted the first loss in its era as a video games company, a prospect that would have been unimaginable only a few years ago. And while game consoles aren’t going away, analysts are skeptical that the business will regain its former stature soon.