I spent three months working in Paris and many of the younger people lived further out and had a 45min - 1hr commute by public transport or driving.
The link you posted talks about narrow streets, this is true in some areas of the city, but Paris also has many wide boulevards.
The traffic during peak hour was pretty bad - the French driving on the footpath meme has some truth to it.
Also old Paris can be like it is because the CBD is located just outside the Peripherique at La Defense.
That being said, the roadways are public property, and should be redesigned to be on a road diet, but building structures in the middle is perhaps not the best idea. Parkifying some sections, expanding others into plazas (while infilling parking to densify) and selling the edges of the roadway to new development so it may be denser would be better approaches.
The rezones happening in our city boost the building density permitted in most of the city while requiring that some of that extra capacity be dedicated to low-income units. It's net positive for those in need of affordable housing and lets developers build bigger, which hardly hurts the economy.
We can have $800 apartments inside the city if we so choose, but with zoning forcing developers to build skinny dual towers and similar, we are forcing the minimum apartment price skywards.
Zoning adds risk to projects and creates an overheated housing market, where the cost of housing is land cost, construction costs, & zoning cost plus whatever the seller can get thanks to the artificially constrained supply.
"They aren't making more land" is entirely due to zoning ensuring most of the city is underdeveloped.
Paris has a set of issues like any major city but when it comes to managing urban density it does it broadly better than LA, for that matter so does New York.
https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou...
However a better idea would be to reduce the need to travel long distances by building denser. LA roads are super wide right now, so the easiest way to raise density would be by putting buildings in the middle of the road, leaving a Really Narrow Street (tm) along either side. Ground floors of new buildings could be commercial, upper floors residential. (Some LA roads are so wide we could put 2 or more blocks of Really Narrow Streets in the space consumed by a single car-oriented surface street).
This would reduce housing prices by bringing a crazy amount of inventory online, and would greatly lower maintenance expenses by severely curtailing the number of square feet of publicly-funded roads, traffic lights, signage etc. If we structured this correctly, the city could make a giant pile of money in both land sales and new real estate taxes. Maybe they could then use the surplus money to build a real train system or just reduce taxes. Lastly, there would obviously also be large environmental benefits such as smog reduction, CO2 emission reductions etc.
Yes, I realize this will never happen, and yes, I realize I'm proposing turning LA into old Paris. Old Paris is great, we should copy it more.
I stole these ideas from [0].
[0] http://newworldeconomics.com/the-eco-metropolis/