Ignoring the flexible beam targeting capability of the Spaceway birds, either one of the new satellites should have the spot beam capacity of SW1 and SW2 combined.
Spending targetable beams on an area half again the size or Maryland seems like a waste.
Actually, you are likely correct, that the new birds will be able to cover as many or more areas as the space ways. But that makes your second part so very wrong. You can now use the entire bandwidth of the space ways to give an entire market every channel that is on the other main birds that the other main birds can't hit because of positioning, but the space ways can. Seems like a no brainer to me.