Thank you for the clarification. I seem to have misinterpreted your intent. But, in line with my previous comments, and also agreeing with yours, I think Apple TV like numbers for the product would be considered a success when our expectations are reeled back to be in line with its purpose/usability.
I believe last year somewhere around 7 million smart watches were sold. If Apple themselves did that number, or even 6 million (to make it 500,000 a month), I think that would be a huge success on their end.
Definitely. Nobody should read my posts that I think this is an

TV level of sales product as a negative. I think I read somewhere that

TV has sold 18 million units. If total smart watch sales last year were 7 million, Apple would be King of the space by a long way. And again, I love

TV (I think it's one of Apple's best products).
If we can "move the goalposts" on how we define success, we can imagine the Watch being HUGE or a FLOP. Relative to say- iPod Socks- I'd bet heavily on HUGE. Relative to iPhone, I'd bet heavily on FLOP.
My perception is that Apple and/or the press is generally trying to spin Apple Watch as next big thing. There was a recent article where an insider said that Apple saw this watch on the same "game changer" level as iPod, iPhone and iPad. If true, I (personally) just don't see it. But if I'm wrong, good for Apple and good for all those watch buyers.
If I was guessing, it is an automatic "success" just because it's something new from Apple that can be had for as little as $350. The fans that would buy anything new from Apple will probably buy enough to make it easy to claim "best-selling smart watch ever" and similar in the coming weeks. But after "we" own one, the question becomes will the masses beyond us open their wallets in a big way too? Either way, it will still be spinnable as a success relative to however one defines the success metric.
If I was betting today, relative to the sales volume of:
iPod Socks: a MASSIVE success
iPod hi-fi: a MASSIVE success
Any other single smart watch model: a MASSIVE success
All smart watches combined: a great success
car play: a similar success

TV: a similar success
one-year Mac unit sales: maybe in the ballpark
iPod, iPhone, iPad: not close
But that's pure speculation. I'm open to it outselling everything if the masses can be moved to want one or two for themselves and their families.