Nintendo is not in as direct of competition as Sony and Microsoft. But I think Switch will have better lifetime sales. PS5 will almost surely sell less than PS4 due to better competition (Switch and Switch 2, Xbox Series X/S). I still think PS5 has a very good shot of 100 million. Maybe even a few million more than that to pass the PS1.
Lifetime Sales Predictions
PS4: 130 mil (was 100 million) Xbox One: 55 mil (was 50 mil) Switch: 110 million (was 73, then 96 million)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima