Yes, I would agree. I was speaking specifically of the Lehigh Line. For almost a decade, they had to share a single track route with CSX east of Bound Brook. Like I said, the Southern Tier was there to even things up and help NS add to competition but up to this date, it has not been a real factor.
No one would love to see them use the High Bridge or Washington Secondary routes more than me, but I don't think it was considered by NS for use at merger time. In the future, when traffic levels warrant, and only after the Lehigh Line and Southern Tier are exhausted, I think there is potential for thinking outside the box and spending money to make things happen. I always thought that the Morris & Essex/Boonton Line would make a great bypass for Allentown to Croxton traffic... though that would probably require going through a lot of red tape and have NIMBY's coming out of the woodwork. Clearances might also be an issue.
By the way, I also read recently that NS is starting some sort of new "Premium Intermodal" service. I don't know any details, but if that service makes it to NJ, they will need to keep the Lehigh Line very fluid.
I think it may be possible that NJ Transit might not be the perfect, infallible organization that most people assume it is.