The typikon only provides for two situations regarding both Christmas&The Lord's Baptism, neither of them having any provision for a midnight liturgy of St. John Chrysostom. In some situations there should be a vesperal liturgy (St. Basil's) on the eve of the feasts, the royal hours and the vigil, but never is there mentioned any midnight liturgy.
Plus, it is telling that these midnight liturgies seem to be confined to parishes in America, and not in the Old World. A more plausible explanation for them would be twofold:
1. Fulfilling the liturgical obligations of the day as early in the day as possible, so that the rest of the day can be spent within the family, as is the custom here.
2. Roman Catholic (perhaps even Protestant) influence/inspiration, since these traditions have a midnight service on Christmas , the Catholics actually having three masses.