Oh, sure, I also believe that they should scrap the 750 mile rule and appropriate federal money to help build up NEC-like corridors outside of the NEC. And I also think that the long distance trains serve a useful purpose, even if for a significantly smaller number of people than the corridor trains. However, under the current political reality those appropriations aren't happening, and neither is Federal funding to keep the current system in place. Amtrak has to make these cuts, as revenue has cratered, and it does make sense to make the fewest cuts on the parts of the system that are actually a significant part of the overall transportation system.
It's also been pointed out elsewhere on AU, that although the NEC trains aren't directly state-supported, the state-funded commuter agencies along the NEC do make substantial contributions in maintaining the infrastructure. So it's not like the NEC states are getting a totally free ride.