It's debatable if the smart watch (any brand) market will take off or not. Personally, it's a bit premature if you need to tether it to a phone in order to use most of the features.
But I'm betting NFC payments will take off as a result of Apple Pay. While it's only available on the iOS platform, there are millions of iPhone 5 owners who have access to this.
Other NFC payment systems never really gained traction because they didn't do the legwork in securing agreements with the 3 major credit companies and retailers in the U.S.
All of which will have to purchase the Apple Watch in order to use Apple Pay as neither
the 5, 5s or 5c supports NFC.

