Reggie's gonna obviously lose his bet, but it's partly the fault of the host, who basically backed him into a corner on betting against the 360 version. All Reggie said was "one particular platform." If the host would have left it at that, Reggie would have won the bet easily, because it obviously outsells the PS3 version in the US. But the host basically set him up to lose the bet, and what was Reggie gonna say.. no it won't?
It doesn't matter anyway. NSMB Wii will obviously outsell the game combined worldwide anyway, which is what matters most. Whether or not the game outsells it in the US alone by the end of January is irrelevant.