And even if it were all-NJT the conflict from Dover to the beginning of three tracks (at Short Hills?) would still exist; I agree that the terminal can't be Hoboken.
Repeated efforts to reach (Ray) Lang were unsuccessful. His slide presentation focused mostly on untapped, larger markets elsewhere, but the map brightened the hopes of local advocates. …May as well ignore that. Several decades away, since it is in the very preliminary proposal stage, Amtrak has never run on this stretch of road in revenue service before, and would be impossible to access NYP without Gateway. Not to mention, Matt Cartwright, the major representative for much of that part of northeastern PA, is already pooh-poohing the proposal.
However, much of the former Boonton Line on the Lackawanna ROW has room for four tracks, so if this were to even get off the ground, that would have to be a possible alternate route to the Morristown Line, obviously not without significant investment however.