I mentioned this earlier, but NY and NJ aren't as hard locks as the establishment likes to pretend. You can bet that after Virginia was this close, they're going to throw every single dirty trick in their arsenal at keeping the strongholds (especially NYC) theirs, but with how bad the local government's fucked up the last few years, the situation is approaching a very similar arc to what happened to unfuck NYC in the 80s and 90s - in that they've actually fucked things up sufficiently that even the hardcore of the base thinks they're doing a shit job. That there's been continual protests in NYC for about 2 months with no signs of slowing down is testament to this.
With the fact that hundreds of thousands of New Yorkers have fled NYC, they've also lost a bit of the numerical power they ultimately rely on, and with the Dems in disarray at a macro level, the Progressives are going to throw behind their own, not establishment candidates, further fragmenting matters.
It is still unlikely that these states will squirm out of this; the establishment will throw absolutely everything at maintaining their powerbase. Losing NY and/or NJ would be absolutely taken as a sign of the apocalypse for them, and would be an unmistakable sign that the end times are nigh (for them).
But for now, this has given people something even bigger: Hope.