Switch will make it to 80 millions this year.
Let's say it gets replaced in 2024.
2021 - 25 millions (105)
2022 - 17 millions (122)
2023 - 13 millions (135)
2024 - 5 millions (140)
2025 and on - 2 millions (142)
That's the track i could see it heading on. It could get replaced before so in 2023 and cut it but i do think 130 millions is almost a sure thing now. We will see where they are heading this year with how they play it. How deep the price cut will be, on which model and if a new model gets released, at what price.
The PS4 was alone on the market, got like nothing wrong the whole gen and will struggle to reach 120 millions, i don't see how the PS5 will top the Switch with more competition unless there is a huge market growth.