It doesn't always mean doom though.....the blizzard sometimes ends a great pattern, but what happens in our good winters is that we don't get torched during the reshuffle. Think of the Feb 7-9, 2015 event when the rest of the country torched or the 1/18/11 front end thump to sleet/ice event after the NAO broke down post-1/12/11 blizzard and before the western PNA ridge popped to give us that great final 2 weeks of Jan 2011.
My hope for this season (and Ray is prob thinking similar)....we enter a decent 2 weeks of neutral to slightly +PNA with a huge ridge over Bering/AK....then we start to reshuffle again, but perhaps that gets blunted by a -NAO forming....we very frequently see blocking return when earlier in the winter had big blocking. We'll see though....before we worry about ending a good pattern, lets actually get one first and get a damned warning event.