Might this have to do with the fact that McDonalds is one of the few national chains that still takes contactless payments? Burger King dropped their support and many other chains don't even have PIN Pads. And we've heard the stories of CVS and such dropping NFC support. With so few retailers accepting NFC, McDonald's is simply sticking out. And with the big boys like Walmart staunchly against it, I doubt NFC will get much more traction barring a big development (I will note that while Walmart's betting on NFC failing--their new C&P-ready pads completely lack the capacity IINM--other retailers are hedging their bets with pads that COULD do it but have the feature turned OFF).