If most people shifted to other forms of transit instead of putting such demand on the roads
I'd say this is an example of putting the cart before the horse. Why would you expect people to shift to other forms of transit before the road network supports these other forms of transit?
Well, they shifted to the car before networks could handle that to be fair. Grade separated highways only appeared after widespread car ownership. We generally build capacity for what exists not what would be nice to have in the future, so if people want to see a world of transit investment maybe they should think about waiting for the bus that shows up twice an hour, which might put pressure to make that come once every 15 minutes, then even sooner, and eventually upgraded to a rail line.
