I expect Apple watch interest to accelerate as people see them in the wild and hear word-of-mouth how they work.
Case in point, my Android Wear watch, which I use for software development, has shown me, and those around me, real-world use cases for a smart watch. Word of this has spread amongst neighbors and friends, who then said they'd wait for Apple to come up with something that just works, or for Google to improve Android Wear a bit. So, interest is out there.
The last few times I have visited various Apple stores, the Watch table always has had a throng of people around it, excitedly pointing and talking. The try-on table was also likewise packed like a big family dinner.
If I could fault Apple on anything is not making it abundantly clear that while there was some initial stock, once that was shipped out to customers, watches would be essentially built-to-order using JIIT lean manufacturing. I suppose they could have marketed that as "your watch is built just for you and shipped from our factories as soon as it is ready" then show factory worker meticulously assembling watch components. I'm sure they thought about all this, though, and chanced an approach that seems the best bet at the time.