Plenty of other equipment around to be used as axle count cars, OR retain the needed Heritage Bags for said service, just like certain Heritage Sleepers and Heritage Diners have been retained.
You cant take heritage stuff if you dont have it to use anymore, its all for sale. The heritage car parts inventory was listed recently and sold off. Either to private car people or to scrap, im not sure if it was every part but any parts in the northeast are now gone. Amtrak is shedding unnecessary items which is a good thing. The H bags are not needed anymore and the extensive cost to maintain parts and repair for them is going to cost them a lot more than rolling around some brand new diners or even new sleepers and bag dorms. Parts for running gear are fully interchangeable with horizons superliner 2s etc so that helps a lot.