[taiwanboy]

There are a few dynamics at play here

1.) even with some declining cities, US cities are still some of the most powerful in the world. According to https://howmuch.net/articles/the-economic-size-of-metro-area... (2017) Bay Area economy is as large as the entire country of Nigeria, NY area is as largest as Canada, LA is as big as turkey! Even Portland is as big as Qatar! And with the global slowdown in 2018 and 2019, while US is the sole bright spot, the dominance will only be magnified.

2.) demographics is now shifting to where gen z is the biggest generation now. In 5-10 years they will be establishing families and moving to less crowded suburbs and smaller cities. Which means the mega cities will lose some growth and the secondary cities will gain.