This is the thing that amuses me - Why is rollout of contactless so slow, and why is it being reported as being specific to Apply Pay?
AFAIK there's nothing for retailers to do to support Apple Pay! As long the reader the EMV contactless standard, it supports Apple Pay (and PayWave and PayPass and other brand names). It's all on issuing bank to support 'issuing' Apple Pay 'cards'.
I added my US credit-card to my iPhone and used it with Apple Pay here in Australia many times. Even small independent cafes support apple pay because they just support contactless payments.
Despite being much smaller, Australia is the largest market in the world in terms of contactless usage[1]. From last year:[2]
More than 58 million Visa PayWave payments were made in July
alone, up from 28 million a year ago and 40 million in
January with average transactions standing at $31.38.
[1]: http://www.mastercard.com.au/_assets/docs/2014-03%20MCW_RBA_...
[2]: http://www.news.com.au/finance/money/contactless-tapandgo-pa...