It seems you don't understand what's going on in Brampton. Brampton is currently the hotspot for the tens of thousands of international students that come to Ontario every year. They are the reason why Zum ridership has absolutely exploded in the last decade, currently smashing pre-covid records.
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These students are currently packed in small apartments that house up to 24 people, and that don't have the money to afford or get around by car. They also make up a large chunk of the Kitchener Line ridership including packing the coaches with bikes (If you've ever been on a weekend Kitchener Line train, you'd see just how insane it gets in terms of ridership).
All of this is to say, if there is a city that can easily generate the necessary foot traffic for such a project, it is without question Brampton.