There's no need for such an policy even if it were a strategic goal. Urban environments have been "nudging" people towards greener pastures since the 1960's.
Interstate highway system, FHA/VA, Fannie/Freddie, desegregation/civil rights passed by otherwise racist deep-south representatives, and the most disruptive civic changes coinciding with the touch-and-go moments of the cold war... Necessary or not, it happened.