This I think is its problem. It is probably the first Apple Device that has been released without a sharp use case. I mean it is cool that I can answer phone calls from my wrist (A candidate who I interviewed for an hour could not tell I was talking from my Apple Watch). But it is not a necessity.
This is in essence the problem with wearables. To quote an article from the Economist : "One measure of a wearable device's success is whether you would turn around for it if you were halfway to work—as you would for a smartphone. Yet market research suggests that consumers are not willing to make an about-face and fetch their fitness trackers"
Ref: An year old. http://www.economist.com/news/business-and-finance/21613925-...