It's much worse: w/ 3? Reps going down in NY, the entire NY-NE area now has 3 Republicans and 49 Democrats, unless I am mistaken. Even if one adds NJ, it will still be staggering 8 Republicans and 57 Democrats.
Reps also lost NY Senate and DE House. I still don't know the results for PA, but if Dems manage to hold the House there (and don't lose ME), the only legislative chamber anywhere between DC and the Canadian border might be the PA Senate.
While it is still too early to call the Reps a regional party, it might be time to call it a regionless one