Last year's January was the odd five week period that happens only every five or six years, so if Switch manages 270k again, it will be a good result. 300k would be great, resulting in a weekly sales rate of 75k compared to last year's 54k.
Predictions without giving them much thought because I haven't looked at the NPD prediction tool:
Switch - 250k
PS4 - 210k
XB1 - 150k
3DS - 30k