And yet when you walked into GAME, the Wii section was a quarter the size of the PS3, 360 and DS/3DS sections. In retail it is generally the norm that the shelf space is representative of product demand and movement. I think think SB's point about Nintendo exclusives selling disproportionately well relative to Microsoft rand Sony exclusives may be part of the perceived (mine at least!) attach skew. Mario, Smash and Zelda all sell extraordinarily well (real attach, real sales) relative to Gears, Halo, Uncharted, God War and Spider-Man and it was no different a decade back.
Why? Who the hell knows, somehow Nintendo has managed to keep that hardcore buying their consoles for the few exclusives they actually do release.
Look at Breath of the Wild sales on Switch, it launched on a new console where demand outstripped supply and an older console that nobody wanted yet it smashed Nintendo sales records. I bought a Switch for the long term appeal but the day one appeal was Zelda. You really don't see that with Microsoft and Sony console launches or game sales wider.