They will be more expensive than the Switch, but they are launching during the holiday season. That's a massive advantage. PS5 will sell the most in its first two months. Tough to say if Xbox Series X will sell more than the Switch in its first two months, but I think it can.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 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