Politically do you think there is any reasonable possibility of getting any support out of this current administration for service in the parts of the country that resoundingly does not support them?
Is there any evidence for this other than projection (that's what the Republicans would do)?!
Biden typically rode the NEC before he became President because that's where he lived and worked, but I've seen no indication he wants Amtrak to improve only in the NEC. Transportation Secretary Buttigieg is from Indiana. And Amtrak's corridor improvement plan does little for long-distance trains but it
does propose a lot of new corridor service in red and purple states. A Presidential Administration or Amtrak seeking only to spend money in blue states wouldn't be proposing an Atlanta hub connecting to Nashville TN, Birmingham AL, and Montgomery AL, or eight trains a day between Chicago and Indianapolis, or new corridors in Texas extending into Oklahoma and up to Kansas.
You can figure any significant Amtrak money is going down that black hole called the Northeast Corridor, where if you are lucky you get 10 cents value for every dollar spent.
Yes, a good chunk of the money from Congress, however much that is in the end, will be for the NEC. Tens of millions of taxpaying Americans live and work there, and owning the right-of-way ain't cheap. But like home ownership, ROW ownership may involve shelling out more money than being a tenant but gives you control that a tenant will never have.
However, it's not true that "any significant Amtrak money" is strictly for the NEC.
Picking a random link from a Google search, Amtrak's 2021 budget request (from early 2020 before Biden was elected) was roughly 2:1 National Network-to-NEC. The 2022 transportation budget from the Biden Administration
(here) (go to numbered page 59/actual page 62) seems to be roughly half NEC & half National Network.
The problem isn't the NEC, it's how much hasn't been spent on better service outside the NEC. Once you start playing the zero-sum "if it's not
Scottish my service, it's crap!" game, you lose because you're playing on the opponents' field. While you're arguing that the NEC is a waste, the highways-only people are arguing that public spending on the NEC, other corridor trains, long-distance trains, local transit, or anything other than cars and trucks is a waste. Only they're arguing louder and with more money than you, and they're nodding along as you condemn the wasteful NEC
and the NEC-only faction condemns the wasteful LD trains.