I DO think these seven have screwed themselves. they will get a pat on the head from the MSM for a week, and never get any more Dem votes. While losing their base, in their state and nationally.
Even in New England, I would assume the average "moderate" (whatever that means) would not know either major party candidate in the next senate election, or be a Dem activist trying to flip the seat. the Republican activists WILL know, and remember, these senators next time. And not to help them, believe me.
I think what is needed is some old fashioned yellow dog Democrats to take back a cut of the Northeast. Many "moderates" vote party out of habit & don't pay any attention to what their reps do once they're in DC.