I did a prediction contest last year about the last 8 weeks for the main consoles in Japan, but it wasn't all that popular, so I was very lazy this year. Instead I will just post the contezt in this thread, and my own prediction with week 45 and 46 already included.
Last 8 weeks (weeks 45-52) for the main consoles in Japan
Switch
2017- 1.302m
2018- 1.506m
2019- 1.587m
2020- 1.556m
2021- 1.238m
2022- 1.161m
My prediction 2023- 985k
PS4/PS5
2018(PS4)- 382k
2019(PS4)- 285k
2020- 48k(PS4) and 255k(PS5 launch)
2021(PS5) - 66k
2022(PS5)- 311k
My prediction 2023- 540k
XBS
2020- 31k (XBS launch)
2021- 15k
2022- 22k
My prediction 2023- 29.5k