As has been pointed out, Amtrak funding is a deal whereby the Members from rural states consent to funding for the NEC and the members from the NEC states consent to funding for the national Network, But it;s not quite that simple. After all, there's a lot of National Network that runs in NEC states -- LSL runs in MA, and NY, CL runs in MD and PA, the Cardinal runs down the NEC and VA, and, of course, the Silver service connects the NEC with the southeast. Then there's the issue of the non-NEC corridors, which, presumably the anti-LD folks in Amtrak support, but are hobbled by the 750 mile rule and require the interest of the states to provide funding. This is not true of the NEC, but apparently the state commuter agencies there do contribute a lot of $$$ to building and maintaining the infrastructure.
The problem with the anti-LD crowd (of people who otherwise support passenger rail, remember there are a lot of people who think that rail is outmoded 19th century technology and should be replaced with hyperloops or whatever) is that they can't see that LD rail does have a place in the national transportation mix, and if properly marketed, can even pay for itself. So, as jis points out, Mr. Anderson or not, Congress is probably going to appropriate money and force Amtrak to run something like the existing National Network, but people like Mr. Anderson don't have the imagination or inclination to see the National Netowrk as anything but a nuisance foisted on him by congress.
Moving forward, what I would support is to eliminate the 750 mile rule (or appropriate money to the states to support corridor service, or both) and develop more corridor services co-located along National Network routes. This allows the LD trains to share the overhead costs, thus improving their financial performance and also feed passengers between the two types of service. Finally, the leadership of Amtrak should out and about in both Congress and the transportation industry cheerleading for passenger rail and explaining why its not some washed up 19th century technology, but rather a solid component of any advanced nation's transportation system, as indeed one can see in all of the other advanced industrial nations.