I would think that this plan would net 3 demonrat and 3 Republican Senators.
It would, as has been mentioned above break up the 55 EV monster in presidential elections which would be a good thing.
But, because it would be good for the country, I doubt the demonrats will let it happen
Everything North and East of Monterey County would be Norcal, and most certainly 2 Dim Senators. The Entire Bay area combined with Sacramento County would have more population than the rest of the Counties combined.
The to combine Monterey County with everything south to LA county would ALSO be 100% Dim and two new Dim Senators.
Only the SoCal division has a chance of being Red.