The OP is discounting Nintendo fans that play primarily 3DS, which is still a larger user base than PS4.
There's also some history to the user base on this site.
- Last gen Xbox 360 and Wii were super strong and there were plenty of fans from all sides here. This gen Xbox One is behind PS4 on power and games, and this really reduced Xbox fan participation. There's been little to be hyped about on Xbox.
- Wii U has been a disaster, but the core Nintendo gamers on this site remained pretty hyped about the Wii U exclusive games, and also have 3DS to follow. The Switch also created new hype. Also an observation: the Nintendo gamer on this site cares more about loyalty to Nintendo hardware than PS & Xbox users are to their hardware. For example the dude who says he'd be excited to play GTA V on Switch... a game that could have been played for years and in better form on all the other platforms.
