According to my first calculations for this thread: By the 4th week of last year, the PS4, Xbox One, and Nintendo Switch sold through roughly 7.15%, 4.97%, and 5.75% of their yearly sales respectively.
Applying those same percentages to this year, given the first 4 weeks of data we have now, this is what all three systems would sell in 2019:
PlayStation 4 - 14,644,360
Xbox One - 4,827,667
Nintendo Switch - 20,292,569
Hardware Comparison Threads:
Current Thread
Is Hardware Getting TOO Powerful?
Older Threads:
PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017