No one has yet commented (that I have seen) on the new cold meals for gluten free or wheat free passengers. It is probable that special meals of this type would be salads. But if one is truly taking a long trip, salads at each meal just don't cut it. Look at a train like the Lake Shore Limited. An end-point to end-point ride involves numerous meals and an all-salad menu doesn't sound appetizing. And what if this menu was implemented on multi-day western trains? That could kill the deal as far as long distance travel.
Many of us have spouses with whom we take train trips. I've taken my wife along for years and she has always enjoyed the dining car experience. If that is gone, it will be difficult for me to get her on a train.