Hell, imagine if that's Biden's map - Michigan + Georgia
So long Rust Belt, hello Sun Belt!
It would even work without GA or MI if he wins NC, although he'd have zero room for error with faithless electors.
That would be horrible for the senate unless trends aren't real for Tina Smith, Gary Peters, and Jeanne Shaheen. I would think that the electors would stick with Biden because if one of them voted for someone else, they would receive numerous death threats. Imagine if this happened:
The final election results look like this.
President
Biden/Harris: 270 EV
Trump/Pence: 268 EV
Senate
Democrats: 50 (+3)
Republicans: 50 (-3)
(Republicans win GA-special)
And then when the electoral college votes, we get this:
Biden/Harris: 269 EV
Trump/Pence: 268 EV
Other/Other: 1 EV
The House delegations elect Trump president and the Senate deadlocks 50-50. Pence tries to cast a tie-breaking vote, which is challenged by Democrats in the courts. When it reaches the Supreme Court, the ruling is in favor of Pence, who is then re-elected vice president by the Senate and his own tie-breaking vote. Mitch McConnell is then re-elected Majority Leader by the Senate.
One crazy Biden-state elector changes the outcome of the election from a Democratic trifecta to four more years of Trump/Pence and at least two more years of Majority Leader McConnell.