The idea of a threat would only be used to actually get them to the bargaining table but Ottawa would let them know that working with them could be mutually advantageous.
You guys free up an entire route, via sharing some portions of track, so that there is a complete VIA-only corridor between Windsor & Quebec City and we will give you billions to upgrade your current lines nationwide. You forfeit the Toronto mid-town corridor and we will build the "missing link", We will build grade separations and help you repair and straighten out current trackage in all urban areas you so that you can maintain speeds, improve safety, and and operate faster thru the cities and allow you to run on current VIA rail trackage free of charge overnight. You give up some of your trackage between Edmonton & Calgary and we will give you larger tax credits and direct funding to switch to greener locos and buy new equipment. You allow for electrification on trackage you control but are still used by VIA and we will give you a large rebate on your fuel taxes.
Such initiatives would cost Ottawa up to $10 billion or more but that is a bargain if they can get their hands on these 2 key corridors. This means these 2 lines could introduce HFR almost immediately without the endless community consultations, inevitable cost overruns, ridiculous construction times of new tracks, and years long environmental reviews because VIA would be operating on already operating tracks. Only the trains would change. Electrification and needed grade separation for faster electric trains could be phased over time but in the mean time VIA rail users would enjoy faster, more frequent, and much more reliable travel.