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If you're going to have a transit oriented city, no matter what the employment pattern, you're going to have to have relatively high densities, and transit lines relatively close together so that much of the population lives within ~5min of a stop. In most Canadian suburbs, transit routes are pretty close together, but densities/transit use aren't high enough to justify high frequency service and the densities are also low enough that a lot of people end up working far away, at distances that are somewhat impractical for non rapid transit.
If you have high enough densities to have a good transit grid though and a relatively compact city (relatively few long distance commutes, and also somewhat congested with relatively few highways), and most jobs and ammenities are located at areas well served by the grid (ex where routes intersect) I think you could get pretty high ridership.