The key isn't mega cities with public transport. The key is a scaled web of cities.
You don't need million pop cities. You need 250k pop cities, walkable with good public transport for commerce and logistics, supported and supporting 50k towns with good manufacturing, supported and supporting 10k villages with good agriculture.
If you had a 250k city, supporting 4 50k towns, each supporting 3 10k villages, all about a half hour away each step, you have commerce agriculture and manufacturing within reasonable distribution ranges, and a small enough population to self sustain an entire ecosystem of humanity. You don't need a movie theater in the 10k villages. You don't need cornfields in the 250k cities. You don't need a sea port in the 50k towns. You could live in a village and work in a town and shop in the city all in one day. You could easily transport goods and services back and forth, and offer a wide variety of lifestyles and choices for your population. All this in less than 200 square miles. Over half a million people, all with jobs, all with the types of lives they choose to work towards, with plenty of space to grow food and make the things they need.
The answer isn't mega cities. That's where insane liberals come from because they are so far removed from the real world. The answer is grounding our cities into smaller, more localized webs of interconnected commerce and communities.
Even if you added an additional line of population center on either end to accommodate populations and area needs, you would still have a viable exchange area of goods and services and transport. We currently have about 90 square miles per million people with only about 50 - 70% of that really being livable. But even with that and finagling the numbers a bit you could have 4k hamlets, 20k villages, 100k towns, 500k cities, and 2m pop capitals. 6 million people living in an area less than half the size of Rhode Island with complete efficiency and general homogeny. We already build this way naturally, we just need to adapt our systems to it rather than force our living situations to comply to the globe globohomo urbanite cesspool way of life.
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