If Lancaster and Lebanon Co. could join up with Philly, York Co. join up with Baltimore, what would be really left of that market would just be Harrisburg (Dauphin County). A huge portion of population or HH really is in Lancaster and York counties, which aren't too far from Philly and Baltimore, respectively and are influenced by them to an extent. Two counties (Franklin and Fulton) are or were in the DC market, because of Hagerstown's proximity.
Perhaps Dauphin, and the remaining counties, could team up with the Johnstown/Altoona market counties, and be the Central PA market leftover thats not near enough Pittsburgh, DC, Baltimore or Philly.
Of course, the station groups in Harrisburg market wouldn't like the idea one bit since it means they are out of business or somehow tied to another market far away that way, and they're too many of them, including WGAL 8 which happens to be owned by Hearst, who owns Baltimore's WBAL 11.