I don't really think city planning boards can control how cities grow. A city is a living thing. If it "wants" to grow, let it grow. If it doesn't, I don't think it can be forced.
Detroit learned the opposite lesson and is recovering in part by realizing that the Detroit of today is destined to be a much smaller city population wise than it once was and they are adjusting and "right-sizing" the city accordingly. They are concentrating on the living areas and demolishing and transforming the dead ones into parks, public gardens, urban farming, or natural land. The result will be a smaller city with a ton of really cool history and a cool "post-industrial" vernacular.