Easily 6+

Certain:
Mk8d
Animal Crossing

Basically certain:
Smash

Highly probable:
Botw
Mario Odyssey
Next Pokemon

Possible:
Sword & shield

new 2d Mario

Unlikely:

Botw 2

Next 3d Mario

We'll have to take into account that the Switch itself will be a 100-150 mil seller and many of these games Will continue to sell for the whole of it's life. 

Last edited by Matsku - on 10 May 2020