My prediction is that the Switch will beat the PS4 by at least 30m (and likely much more than that). I say this believing that the PS4 lifetime will be 125m +/-20%.
In fact, this year's sales for the Switch will actually appear low once we see how it does over its lifetime. And 2018 sales will be even lower than this year's. Then in 2019 the Switch's hardware sales chart will look like a rocket taking off, and it will continue to sell impressively for several years after. The Switch will be the best selling console yet, easily outselling even the PS2.
curl-6 bet me that PS5 + X|S sales would reach 56m before year end 2023 and he was right.
My Bet With curl-6
My Threads:
Master Thread, Game of the Year/Decade
Switch Will Be #1 All Time
Zelda Will Outsell Mario (Achieved)
How Much Will MH Rise sell?
My Bet With Metallox