Brings new meaning to the term...
..."City of Brotherly Love."
Imagine, for a second, the uproar if a mayor from a major American city had called for 10,000 white men to patrol the streets. Or 5,280 Jewish men. Or 314159 Asian girls. Or 2718 Hispanic boys. (I'd throw American Indians into the mix, but can't think of a good mathematical constant, right now.)
As for the efficacy, well, I've certainly got no problem with citizens walking their own streets and reporting any problems that they see. I do wonder how many are going to mistake this as an empowerment to overstep their "authority."