Let me guess - Ms Jacobs wants to "encourage" those factors by various means.
What would the Portugese rather have, a "flourishing city area" or a job and technology producing area?
In other news, black families are leaving "flourishing cities" http://articles.sfgate.com/2008-08-10/bay-area/17121007_1_af... . See also http://en.wikipedia.org/wiki/Black%20flight .
In that, black families are like other families - http://www.sfexaminer.com/local/2011/03/san-francisco-becomi... .
Some people prefer urban. However, a lot of people don't. The urbanists are merely one group who hasn't figured out that when an argument suggests/implies behavior that doesn't happen, the argument is wrong, no matter how appealing the proponents find the conclusion or proposals.