For what it's worth....
Sam Damon and I attended tonight's Annual NARP reception in Washington, DC and had the opportunity to speak with Emmett Fremaux (VP of Marketing) at length about various these sorts of things, and I asked him point blank if he had heard of this rumor.
He said that he had, in fact, heard of that plan, but it was one of many that are being considered. It was clear to me that at least from Fremaux's point of view, things were still very much unofficial in so far as what he could tell us. In speaking to Sam just now about it, he mentions to me that from where he stood, it sounded to him like this particular plan never got past the "conversation" stage in Amtrak's offices. That could be, or it could be that Fremaux was just biting his tongue, but that's just my own commentary.
Again, I should reiterate that Fremaux said he had only heard of this option in the context of others, so it appears that what Matt has put forth has at least been discussed, but as far as an Amtrak VP is concerned, as of tonight (May 2), it is officially just an option that has been discussed and nothing more.
-Rafi