I don't think that is so. The crapple watch is a sales flop and apple knows it. There are many more android variants in the wild, as well as pebble type watches.
It's hard to say that, As you have a TON of apple fanboys, who will buy ANYTHING with an apple logo on it and that is a good 25-40% of their users (no matter how much you tell one of these people how great WP is, they could care less).
Then taking Apple out of the thought here, talking just about the "iWatch", it is a pretty cool device, has nice options, reasonable battery life compared to Android wear models(from what I read) . Then go into features and apps, with a really nice, almost mind blowing display on a wrist watch and so, yea, it's a pretty cool device. And people that know me, know I am not much of an Apple fan.
I use a Pebble watch every day and have been for almost 6 months now, on my 2nd pebble, so I know the smartwatch thing and think of what I would like it to do, the Pebble's limits and the balance between features and battery life (Pebble lasts about 6-7 days on a single charge).
I might say they MIGHT get close to the 68% of iPhone users (5 and 6 models) but, 68% of the smart watch market, they must be smoking something. As we say in these forums, give proof or it didn't happen. Now if the iwatch could be used cross platform....maybe...
I do hope this week that Microsoft does release something on a Smartwatch, something that is more geared towards WP (Cortana, notifications, etc) with EXCLUSIVE WP features that can not be gotten on other models.
Till then, I will live with a Pebble that gives me long battery life and to me, that is in the top 3 things of what I want in smartwatch...