Yep to a degree I think your right, I've noticed this too over recent mild winters - a pattern of zonal Atlantic driven weather IS difficult to shift once set in, I can't remember too many recent winters after having continuous Atlantic stuff then to turn cold. Philip Eden went on record saying that the particularly warm SST's off the Eastern seaboard of the States aren't helping things if you wished for a cold winter in these parts and that coupled with the effects of La Nina.
If nothing is showing on the models by late January I'd start to think of 'writing off' the winter as regards to hard/severe conditions, don't forget also if this weather pattern doesn't change the near continent and probably parts of Scandanavia will be snow free which will not help lets say come February if we do get some form of Scandanavia blocking and Easterlies (as per 2005) so would have to rely on an Arctic blast. Not looking good so far this winter.