Ask any longtime resident, and they'll tell you that most homeless, basically, can't be helped. They have severe substance abuse problems and no desire to settle down.
The vast majority of homeless people are homeless for months not years, and the many programs to aid them in finding housing and preventing homelessness in the first place have a significant measurable effect on the average number of homeless shelter entries and length of stay.
The number of chronically homeless individuals and families in San Francisco continues to decline. In 2015, 25% of survey respondents were chronically homeless, compared to 31% in 2013. Based on Point-in-Time Count data, it was estimated there were 1,745 chronically homeless individuals and 18 chronically homeless families living in San Francisco on January 29, 2015.