Replacement came out decades ago.
Outside government subsidy and the Northeast corridor, Amtrak can't make it.
People just don't want to spend days in a cramped sleeper when they could hop on a jet and be there in hours.
The ONLY time I ever considered taking Amtrak was to go to NYC and stay in midtown Manhattan. The train from Boston goes into Penn Station right under Madison Square Garden(7th and 34th street). We still decided to drive from NH because it is over an hour drive to get to South Station in Boston. FYI, it costs about $45/day or more to park a car in Manhattan. It is over $100/day to park a Suburban.
So, even though I live near the I-95 corridor, the train only makes sense if you live near the train station.