The thought has crossed my mind more than once that while Detroit may well pull out and survive that it will be a very long time before it leads the area again, because in the meantime a lot of the surrounding area has learned how to survive and even thrive again without Detroit qua Detroit. On a long enough timescale its geographical positioning theoretically gives it an edge (Ann Arbor will simply never have a port, for instance, Southfield can't have an international border without a lot crazier things than the collapse of Detroit happening), but that might be a while before it dominates.