So you are planning on deciding ahead of time where to put folks and you have a small city of Smallville with lots of room to expand and 100k people and Megalop

So you are planning on deciding ahead of time where to put folks and you have a small city of Smallville with lots of room to expand and 100k people and Megalopolis with 5M with water on all sides and nowhere to go up save bulldoze the already tall buildings and build taller ones. You don't think that one could theoretically with 1M people's taxable income produce good enough schools to educate folks in the plethora of land available near Smallville. Logically this isn't the sims what actually happens is that Megalopolis gets relatively much more expensive to live in than Smallville driving investment and folks who can't afford $5000 a month in rent to locate themselves there. Note I'm talking about other metro areas not in the woods in rural Idaho. The relative availability of remote work, government locating offices outside of existing metros, tax breaks, major public works could all be factors in making this easier rather than harder but the process is all but inevitable given that current metros seem unlikely to be able to expand indefinitely