I think a better market to look at for contactless payments is Australia. Over here we use them for everything . Apple pay has just started rolling out and pretty much 95% of places I've shopped/eaten at support it. If you're curious about adoption rate, it's a good case study as there's an existing contactless credit card system already in place.
It's slightly amusing to watch the cashier have a moment of confusion as I ask to 'pay by card' then proceed to do nothing whilst I wait for them to get the EFTPOS terminal ready. They expect some kind of shuffling to produce a card instead I extend my wrist out to pay with an Apple Watch.
Can't wait to see what numbers come out from this, interested to know % of Apple Pay transactions on activated cards.