I'm not sure what to make of these numbers. I think consumer buying habits are changing.
The last few years we have seen November sell more consoles than December (or on par) when it used to be December the highest selling month. Now we are seeing bigger drop offs going into January. For Sony, January used to be a ~20% of Nov & Dec combined while Xbox usually see's a sharper drop after a more aggressively priced holiday.
This is why I made 400k PS4 300k X1 prediction. Turn out half of that.
Edit: Checking over the numbers I've noticed a steady increase in Nov & Dec (combined) to Jan drop offs. Start of the 7th gen for the xbox January it was about 15% to 20% of Nov & Dec sales, now it's steadily moved to below 10%. For PlayStation Jan was about 20% to 25% of Nov & Dec sales, it's steadily moved to below 15%.
I'm going to say holidays being much stronger is due to stronger Black Friday deals and weaker January sales over the years and rise of online shopping (people getting products much quicker rather waiting for the weekend or spare time to go and pick a console up from the shops).
We need to stop the doom and gloom comments because of 1 month of average results but look into why buying habits are changing.