Good find.
As for whether it'll happen, you never know. Service to London and Niagara both just kinda happened without a public report or a business case for the currently implemented format; and they're both going to be very heavily subsidized (like $500+ per passenger per trip) for a long time. London is particularly interesting because it doesn't even add local ticket facilities. Future stations reports didn't consider potential new lines, or even extensions (for the most part). In short, a single round-trip is almost entirely a political process.
Adding discount stations might be tricky. Would anyone tolerate a Grimsby type station, with a thin/short chunk of unlit pavement, for a test?
That said, this is a CP corridor and they're much less accommodating to commuter rail than CN.