I bought the Wii U, I never touched a 3DS. I haven't had a Nintendo portable since the game boy. I bought the Wii U off liking the Wii.
Sure Jan. Like i said, a handful of edge cases exist, but arent worth discussing.
The 3DS and the WiiU audience by and large was the same damn thing and everyone knows it. Stacking the two and pretending Nintendo's audience is potentially 72 million (3DS) + 13 million (wiiU) as if the crossover wasnt damn near 100% is completely ridiculous.
No Nintendo console has ever gotten anywhere close to 85 million units save the Wii, and that system's audience (and the DS as a handheld) were both devastated by casuals leaving gaming en masse for phones and tablets.
It would take a miracle for the Switch to hit Wii levels, and 120 million is completely impossible.
The Switch due to hardware restrictions cannot run third party titles that got the broader audience buying units like COD/GTA/Battlefield/Destiny/Fallout/Assassins creed/RDR2. Like it or not these games push a ton of units and the ps4 wouldn't be at 90 million without them either.
Those will stay PS4/XBO/PC. Nintendo's first parties unlike Sony's are ill equipped to make anything similar that might attract that audience.
Nintendo also cannot cost reduce the switch to the levels it did for the 3DS. The 3DS was outdated and overpriced hardware for what it was when it launched, and stripping even that down to the bare bones $80 2DS is the only way the 3DS hit 70m units.
There will be no $80 Switch. The hardware is simply too expensive.