It's too tough to say, given that we don't know when Switch 2 will release. If Nintendo makes a crazy decision and launches Switch 2 in early 2023, then Metroid Prime 4 will be cross-gen or only on Switch 2. But if Switch 2 doesn't come out until 2024, I'm pretty sure MP4 will come to Switch.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 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