How do you propose achieve that for households with more than one person going to work outside their home? That requires being highly selective when accepting job offers and being willing to move and possibly quit jobs often.

Im suggesting that more houses get built downtown in the city.

Not EVERYONE would have to live in the city. A lot are interested, and would move there themselves, and this would cut down on traffic significantly.

Oh, I absolutely agree with building more housing (and office and retail space, etc) and less roads and parking in the city. But that does not eliminate the commute. You have to live in a really small town and/or be very lucky with jobs to not have a noticeable commute. Of course, if you can do that commute on foot, bike or public transit that's better for everyone.