To far out to be able to predict currently... it could be anything from 50m to 100m.
I think a better question would be something like :
"Do you think Switch beats PS4 in yearly sales (2017), in the US?"
January to June 2017 (NPD supposed leak data)
PS4: 1,780,423
Xbox One: 988,946
Switch:1,572,062
This is a intresting question instead, of people guessing at something you cant possibly reliably predict yet.







