on 25 January 2020
There's almost no way Switch will outsell PS4. The PS4 has already passed the Wii and PS1. PS4 is looking at 120-135 million title units sold. Now will the Switch outsell the PS5? Probably. Even if the PS5 sells more than the PS3, I don't see it surpassing the PS4 and PS2. Let's all remember that the PS4 has been a sales homerun because of Nintendo and Microsoft screwing up. The Wii U had horrible marketing and an underutilized gamepad. Xbox One forced Kinect 2.0 down your throats, leading to a ridiculous $500 price tag.
The PS5 will have a harder battle than the PS4. The Xbox Series X looks to be a much better console than the Xbox One. The Switch will still thrive for at least a few more years, and then get a successor midway through the life of the PS5.
As for the subscription aspect, I don't see Sony releasing almost all of their first-party lineup on Windows. Especially not the way Microsoft has been doing it. Yes, we'll see more Sony games on Windows, but I don't think it will be that big of a game-changer. Sony wants you to buy their hardware. Just look at their stance on cross-play.
Nintendo would have to add a lot to their online to justify a $60 yearly subscription. Either greatly improve the online itself, or add N64 and GameCube titles. I hope they do both, and I hope their online subscription doesn't go up to $60/year anytime soon.
Lifetime Sales Predictions
Switch: 125 million (was 73, then 96, then 113 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 122 mil (was 100 then 130 million) Xbox One: 50 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima