I think when it comes to metropolises, one of the elements that makes them possible in the long run is a location that is a hub type or has natural amenities th

I think when it comes to metropolises, one of the elements that makes them possible in the long run is a location that is a hub type or has natural amenities that lend themselves to comfortable low-cost living for generations as a relatively small village. It has to be nice enough not to move away from for people who would do perfectly well anywhere, including a big(ger) city. Then it must be attractive enough and welcoming to newcomers in a continuous way for critical mass to build over the period of time necessary.