To keep BF's impact in perspective, here is a US November 2014 sales breakdown:
W1 - X1: 232,445 PS4: 135,505
W2 - X1: 188,761 PS4: 123,078
W3 - X1: 219,248 PS4: 168,505
W4 - X1: 634,001 PS4: 447,061
Total - X1: 1,274,455 PS4: 874,149
According to announcements, on BF, X1 sold 721,569 units, and PS4 sold 554,350 units (undertracking of ~18%). That means that BF accounted for approximately 48% of X1 sales and 53% of PS4 sales for the month, with the X1 winning every week of the month. By all indications, the PS4 has won all previous weeks this year and has a significant preorder amount counting towards November, so a repeat of last year's BF would most likely result in a PS4 win this November.