Those are Amtrak California, not Amtrak, and they are not affected by the change in discounts, since California apparently has chosen to continue most of the discounts that Amtrak is rescinding. So they are irrelevant in this discussion.
The point still remains that as long as the aggregate ridership and revenues are up, they will not worry about it. They might address specific routes if they affect the big picture sufficiently, but not otherwise. This is just plain reality of what happens when the hands of a management team are forced by specific requirements by their owners, which is exactly what is going on with Congressional dictate communicated via the Amtrak Board.
I think you have it reversed.
Revenue and ridership on the NEC dwarfs everything else. So aggregate ridership might be up if ridership is up on NEC...and down everywhere else!
It makes no sense to establish a national policy because of what is going on with the NEC.
They should do the opposite.
Discontinue the discounts on the NEC, weekdays, only.