In my experience, currently public transport works really well for high density routes, but no one has managed to solve the low density route issue. Take a bus going towards a leaf node at 10 pm on a week day, and you're often the only one in a huge bus with the driver (that's of course if you're in a place where such a bus exists). Environmentally and economically, that's dreadful, worse than a car. I don't think public transports running at 5% capacity is the solution.

The solution might be full self-driving cars, but we're far from it yet.