I think the thread title should be "PC Dominates Gaming Hardware Expenses". Hardware sales leads us to think about the userbase, which in this case isn't, once sales are being measured in money rather than gamers. The biggest problem is that many buy a PC to work and sometimes play a little whereas consoles are dedicated gaming machines (no one buys them to work... aside from game developers). Therefore, the userbase of each can be better assessed by the software sales of multiplatform titles (and then maybe adjust them with different speculated tie ratios) than by money spent on hardware.
Prediction made in 14/01/2014 for 31/12/2020: PS4: 100M XOne: 70M WiiU: 25M
Prediction made in 01/04/2016 for 31/12/2020: PS4: 100M XOne: 50M WiiU: 18M
Prediction made in 15/04/2017 for 31/12/2020: PS4: 90M XOne: 40M WiiU: 15M Switch: 20M
Prediction made in 24/03/2018 for 31/12/2020: PS4: 110M XOne: 50M WiiU: 14M Switch: 65M











