At a recent Financial Services Club event, one of the speakers said that it was unlikely that retailers would make changes to their POS systems to adapt to new payment mechanisms, outside of their normal replacement cycles. With one exception. He said they might make the investment in POS if it was for their own payment system. In other words, Tesco won’t change their POS software because some student comes up with a cool way of paying for things with iPhones, but they will change their POS software to launch their own payments service, wallet, device or whatever that reduces costs and increases benefits.
These opinions are my own (I think) and presented solely in my capacity as an interested member of the general public [posted with ecto]