A few points here....
One, newark could use an additional station, so at least the provision for another station between NWK and the rail link should be included. Perhaps south street?
Another thing, is that who the hell wants a big noisy PATH train going to all the terminals when you got a fast and quiet airtrain that is due to get an upgrade anyways? The PATH cars can go as fast as 70 mph, but are restricted to i believe 55 or 60, can you imagine the snail's pace between the terminals? Makes no sense.
Another thing that bothers me is the assumption that it's some straight shot from nwk to the rail link. Firstly, you have amtrak's catenary towers, several highway overpasses and along the viaduct through newark you'd need an elevated causeway, and at some point the line would need to cross over the NEC, as there is no space on the west side of the ROW, and you have waverly yard.... how do you go around that?
And, i dunno where atlantic city airport is coming into play. You take the train or a bus from AC to KPHL. KPHL is going to be getting some runway upgrades, as is newark, so.. moot points both.
Next stop the square, journal square station next!