If there's any solace, there was at least GHD 2 that did the opposite. It had started to trend south at this point on the models, then it corrected back north at the last minute, which ended up being correct.
Granted, it was a different setup and not exacly a Jan '67-esque big dog, but my point is I wouldn't completely rule anything out just yet, especially with a +NAO and the jet dynamics at play. It's not like you need this to shift all the way NW from KY/PA, but just a 50-mile shift.