Switch sold almost 350k on a pretty boring week. We've basically got 4 months left in the year. I figure Switch will sell around 4m total for Sept and Oct combined, considering the 3D Mario collection is coming. Then there are the two holiday months. That is going to be a lot. 10m-ish? Don't know. There is still a lot of demand for Switches at this point. Switch might sell significantly more than 14m for the remainder of the year if Nintendo can produce enough. But 14m seems like a decent enough projection for remaining Switch sales at this point.
Switch is at 15m now, so that would make 29m total for the calendar year, but my holiday number was a very rough guess. I can easily see Switch going higher or lower.