Why would a reverse direction move from a stub station be so onerous? Trains do it daily in Germany at Frankfurt, Stuttgart, Munich and Leipzig stations.
Suspect it might be that many Americans dislike riding 'backward', particularly if the ride has poor NVH characteristics or that wobbly air-bolster lateral sway. Do the seats in the proposed train 'swivel' easily to face, even at an angle, in the direction of travel when the train reverses direction? Probably no help to wye the train on a regular basis, as at Harrisburg, to get around the reversal if the seats are fixed.
Problem is that there will have to be substantial 'marginal advantages' (over the likely alternatives, "Megabus" or driving) for the 'take rate' of a perceived unpleasant ride to come up to expectations for a project with large stranded capital cost and little if any alternative market use. Those might include better onboard amenities, better food ... free rolls of quarters? ... but after spending All That Money On Subsidies I somehow doubt the government(s) involved will shell out additional to make people choose to ride the dogs.
On the other hand, if all that the 'stub' move involves is a reverse wye move out of the station to 'reverse', you have the need either for someone to ride the rear of the train for the reverse move (and then be paid until he gets off conveniently) or for the engineman or whatever you call him to walk the length of the train as it sits, and perhaps go outdoors for a bit to get back in the engine cab without ear protectors.