If we include ports, then 3 is likely. Pikmin 3 Deluxe is already confirmed, and there could easily be another port, a remake/remaster of something, or a new game. I think we'll only get one new installment or a surprise new IP. Breath of the Wild 2 and Bayonetta 3 are not happening in 2020.
I'm holding out a little hope for the 3D Mario remakes, but they're pretty unlikely.
Lifetime Sales Predictions
Switch: 156 million (was 73, then 96, then 113 million, then 125 million, then 144 million, then 151 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 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