Pretty decent Dec for ps4 considering. How was last year?Nov 2018 NPD:
PS4 1475k
Switch 1355k
XB1 1340k
It was an amazing month all round really. Very much helped by Cyber Monday counting in November though, which this year doesn't have. Considering that, this year I think PS4 held well, Switch had a good bump and XB1.... eh, not awful.
PS4 so far is down about 32% YoY, XB1 down about 36% and Switch up 17%. December 2018 looked like this:
Switch 1770k
XB1 920k
PS4 797k
Despite Smash being massive last year I think Switch will be up YoY thanks to Cyber Monday although not by much. After this Nov, XB1 should be down YoY in Decmber. I can only see it declining from November to December like the past two years. PS4 could actually be up YoY in December as last year was so low and this year they're actually doing a deal (plus Cyber Monday). That would be the only month in 2019 PS4 managed to be up YoY and would help lower the overall yearly drop (XB1 also hasn't been up YoY in any month yet). I think my early prediction for December NPD would be something like:
Switch 1800k
PS4 900k
XB1 750k