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Unlikely. Freight companies in Canada are notoriously hard to work with. But more importantly Cambridge is still a very industry focused part of Waterloo Region, so those freight branches and spurs off the mainline do get significant usage. For example, Toyota has an extremely large factory in Cambridge and they ship cars out on train 365 days a year. BWXT is also a huge customer and they have a plant in the city that produces high pressure vessels used in nuclear energy. CP also has a small yard there where they store and shunt rail cars.
But also, it doesn't really make sense for Metrolinx to really even push to get trackage rights to connect Cambridge because most residents of Cambridge aren't commuting into the GTA on a regular basis. People living in Kitchener and Waterloo and even the suburbs outside the cities do because the economies of those two parts of the region are much more white collar (biggest employers are finance and tech, of course) and there is also the colossal student population. Cambridge also lacks an LRT line which would impact GO train usage and it's actually not known whether or not they'll even make one anymore...the projected cost of building an LRT line from South Kitchener to Cambridge is projected to be at a minimum 4.5 billion dollars. That is a fucking insane price tag for a shitty light rail line...Toronto built the Line 4 Sheppard subway line for less money and that is entirely underground and used complex tunnel boring machines.
Metrolinx instead needs to focus on continuing to get all day GO train service between the GTA and Waterloo Region because it's absurd it isn't a thing yet, though it took a long time to negotiate with CN over track rights (and they have been working on double tracking the entire length, so that trains can just pass each other instead of having to give way on a siding for other traffic). They're also building a station in the Breslau neighbourhood, which makes more sense than Cambridge.