There are signs that Amtrak management is realizing that putting all their eggs on the regional corridors may not be the best idea. They've not been having much luck partnering with states, and then there's the proposal to drop the 750 mile rule down to 500 miles. The later implies interest in creating new long distance routes. Granted this could mean more daylight LDs like the Palmetto, but it could also lead to night trains (leave after dinner, arrive before breakfast or lunch) between city pairs. Sleeping cars are actually quite lucrative and help subsidize passengers in economy so they aren't going away unless the LDs themselves go away.
I tend to agree. There are a number of routes that can be covered under 500 miles that aren't under 750 miles:
-CHI-STL-KCY (currently two corridors, but if you "merge" them on some runs they become covered)
-Dallas/Fort Worth-Kansas City (a version of the
Heartland Flyer extension where you don't terminate at Newton in the middle of the night)
-San Diego-San Francisco/Oakland/Sacramento (a version of the
Coast Daylight)
-The
Carolinian as-is
-The
Vermonter as-is
-Some/most of the Virginia Regionals as-is
-Chicago-Memphis (this has explicitly been mooted as a possible extension of the Illini/Saluki)
-Nashville-Savannah is notably "on the bubble" here (extending to Jacksonville would solve any issue)
-ATL-NOL would depend on routing choices, but it
looks like both the current routing and routing via Montgomery/Mobile should make it
A few others come up short as-is, but some extensions would push them over the edge:
-CLT-WAS is short (ATL-WAS qualifies, as does CLT-NYP [per earlier]).
-CHI-OMA via Des Moines is short, but Chicago-Lincoln should qualify.
-CHI-MSP is short, but CHI-MSP-Duluth would be long enough.
In general it feels like there are quite a few places where Amtrak could leverage a 500+ mile route to fund capex in exchange for an operating deal with a state for some shorter runs (i.e. "Send the second CHI-MSP train to Duluth while Minnesota agrees to let Amtrak run the additional trains on that route".
So I would say that this definitely opens some doors to Amtrak seriously negotiating with states to kick in substantial support to some longer routes and thereby "move" some expenses off of the states' books.