From browsing the oldest cited patent, #7334720, which was filed rather recently (2006), a three-pronged defense can be imagined: (1) obviousness rejection of the patent; (2) rejection due to prior art; and (3) the claims describe a common method of doing business, with the difference being it's "done on a computer", which is insufficient for receiving patent protection.
However, the problem here is Texas.
EMV are also interested in security/minimizing risk, using fully audited technology. Hopefully Google and Samsung obtained the blessing of the EMV group before making their recent mobile payment deals. not that I care.