Unfortunate that the option to connect from DC to PS service is gone but frankly I could rarely justify it anyways because it effectively added 2-3 hours to a 5 hour trip. Given the light loads I always experienced (out of about 8 times booking it) and the fact that 3 out of those 8 times it was canceled and I had to scramble to either a rebooking on amtrak or out of LGA I understand that it probably made sense.
Hopefully there is a new route added somewhere instead of just yet another cut in the network.