Sorry, I must have missed the official Apple press release announcing the total number of Watches sold, unlike Steve Jobs specific announcements of iPad numbers shipped during its first year.
Of course in 2010, there were also a lot fewer iPhones in the world (in the hundreds of millions I think).
And last I checked, what goes up must come down. Apple's iPhone sales have gone down for the last quarter year over year. And the iPad has been in decline for years. So clearly, sales can't only go up for an Apple product. In fact there doesn't even seem to be a correlation as to when in a typical product's life cycle they will go down.
So nice try to discredit an opposing viewpoint, but without actual facts, I guess we'll both just have to agree to disagree and see what happens.