Real estate development is very much a "build it and they will come" sort of deal. It takes capital, a lot of it, to make an area desirable. You can't just dump it anywhere, there has to be a good reason to dump it in this particular area otherwise the hip young people will go somewhere that did have a good reason. And the poor investors who poured money into a development in that area won't see any appreciation or significant profit, because no one else is developing the area, just them. Lots and lots and lots of money going into lots and lots and lots of developments, that's what turns the sticks into the burbs.
You just can't put the family cart before the development horse, every young person starting a family has different reasons for moving out to the sticks. Left alone without already-developed real estate, they'll just spread out evenly across rural America.