Unfortunately, Amtrak's Northeast Corridor basically makes money that it loses in almost of its other routes. There may be a few city pairs here that may eke out a profit but not a lot.
There are some spectacular views, but remember that a good portion of it happens in the dark and you end up looking at a lot of nothing.
It really is an experience, as long as you go first class (sleeping berth).
Some routes have events for the first class passengers that are themes with the route. Wine and cheese tastings, for example. Or miniature margarita and nachos fiestas.
What I find interesting is that the level of service varies from run to run. I suspect due to staffing issues. Not everyone wants to spend a week or more away from home at a time to be a waiter.
If I had to take one of those routes again, I'd do it as a sleeper car passenger.
I took the Empire Builder as regular passenger. I'm glad I tried it once, and the views in the Rockies were amazing, but 30+ hours straight in a reclining seat is a bit much to do again. I think it would have been much more enjoyable with a proper place to sleep.
It's pretty clear that these routes are under threat. I intend to ride as many of them as I can before they close.
It's definitely worth the time.