I dunno--I can still get to NYC, Washington DC, or pretty much anywhere in the country cheaper on an airplane (oh, and faster with more convenient schedules) than I could ever hope to on a train, even here in the rail-rich New England corridor.
Here to Boston for a day trip, I'll consider it. Otherwise, it's the take your shoes off stuff your shit in one bag so you don't get nailed with baggage fees airport shuffle.