While it was possible for Nintendo to make a 'Switch' during the Wii era, it would have been less successful. The DS and Wii were just too different to mix up without cancelling out what made them unique. The 3DS and Wii U era was more possible, but it required a non-existent 3DS, which gave Vita no real competition in the hand-held only realm, perhaps.
Anything earlier than Wii would require them to have much weaker systems. Imagine a much weaker N64, or SNES. NES wouldn't even have the technology.
The 9th generation was really when the strategy had the best chance in succeeding.








