I know a lot of people on this forum and elsewhere are extremely skeptical of this, but I sincerely believe self-driving cars are the solution to the problem of Toronto's suburbs' transit. Traditional mass transit in the form of larger buses, streetcars, LRT, subway, and heavy rail will, I think, probably remain necessary in major corridors, but for first/last mile trips and local or suburb-to-suburb travel, I really think self-driving cars will fix it. That might not happen until 2035 or 2040, but I don't think anyone can reasonably debate that it is inevitable and by 2050 as the absolute, worst-case latest date.
I love the idea of most people no longer owning cars, but rather there are fleets of self-driving electric cars run by Tesla, Uber, GM, etc. which roam around, pick people up and take them where they need to go, find somewhere to recharge, then go out and do some more work. And once 100% of vehicles are self driving, and the law prohibits manually driven vehicles, then (and this is where most people get skeptical, but I'm not) congestion will disappear since self-driving cars, if they constitute 100% of the vehicles on the road, can drive 1 metre from another car's bumper at 200 km/h safely, and there would be no need for traffic signals except for pedestrian/cyclist crossings (optimally with 100% self driving cars, for peak efficiency cyclists should be relegated to off-road trails or at least curb-separated/raised cycle tracks).
Of course, we do need a solution for the 25 years or so until that's a reality. I think micro-transit is the only solution that has even a chance of being feasible, run as an UberPool-type service, or using small buses like that failed Liberty Village private transit project did. Innisfil's results working with Uber are extremely promising. But I don't think that will shift the modal share that much since, for someone who owns a car, it just doesn't make any sense--it will make their trip slower, less comfortable, and more expensive. That can only be solved with full self driving roaming fleets where it no longer makes any practical sense to own a car.