So, how much will the Switch sell in it's first year (March 2018)?
Here's past consoles/handhelds first years for comparrison (VGChartz numbers).
Wii - 14,519,705
3DS - 14,361,871
PS4 - 14,238,195
DS - 9,290,236
PSP - 8,069,020
XOne - 7,768,163
PS3 - 6,004,047
X360 - 5,943,800
Wii U - 3,900,583
Vita - 3,829,432