I am looking from the point of view of physics. Transit runs buses and trains, each making frequent stops to load/unload passengers, and, busses, at least, obey the same traffic laws the cars have to obey, e.g. they cannot run red lights or drive against traffic on a one way street. Even not counting the suboptimal route, a bus will always be slower than a car, it's just physics. Trains might travel faster since they don't use roads but their routes are even less optimal because the railroad is a giant nuisance on top of being expensive so you are likely to spend more time getting to/from a station than you can win on a faster travel.

But I see that your suggestion is actually to degrade the infrastructure to the point that you need to spend a lot of time to park. That's quite an "improvement".