Switch is selling 25.5% more YoY as of 1st of december.
FY2017 shippements were at 15.05 millions so if we add 25.5% it will end up at 18.9 millions as it stands.
The gap is 1.1millions. I think SSBU, NSMBUDX and eventually another game release in Q4 can close this gap.
19.5m is the worst case scenario in my opinion.