ApplePay didn't kill CurrentC, WalMart did. In fact, it just morphed into WalMartPay. With over 20 million current users of the WalMart App, six months of working out the kinks, and now the addition of 600+ WalMarts, this will only have it ready for the holiday season.
You may not like WalMart, but for tons of people, it's a beloved retailer. And for many, many people, it's the only option. In tons of college towns it's the preferred (if not only) large retailer. Many of those college students will become loyal customers. So hooking them on WalMartPay is a smart move. It will only get better with time. WalMart is a behemoth and will not cede anything to Apple. Gathering all that data from millions of transactions will reap rewards for them. And make it lest likely that ApplePay will be supported any time soon. If at all.