Well, it depends on how Nintendo wants to do it... Like, if they once again, launch with a gimmick like how 3d was + over price it during launch + have it under-powered due to the gimmick, then I can see it be a decline but if they do it well, I can see an increase in sales cause most likely, Sony isn't going to make a successor to their handheld after the vita's low sales imo. So the Japanese third party might come to Nintendo's next handheld platform if Nintendo plays their cards right
And same goes for Nintendo's next home console. If they play their cards right, it will be an increase but if they focus on a gimmick that doesn't justify purchasing the console in the eyes of most consumers, then it will either decline or stay about the same as the wiiU
And if its a fusion hybrid nonsense, then I say it will sell significantly less than both 3ds + wiiU combined
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