I think a portion of it could work. The problem is the people he specifically named are often people with high levels of mental health issues. There is a fairly large difference between your "typical homeless" and the "very visible" homeless he mentions, they are far from functionality. Typical homeless are still trying to figure things out. The very visible, in many instances, have given up and just don't care any more, or cant care any more. The farm thing might and could be good for therapy and rehabilitation (as in healing- physical, emotional, psychological), but the concept of arresting people to move them to an internment camp is rather appalling. The entire point of housing first is to get people off of the streets and treat their issues once you get them off the street. That is ultimately what he's proposing but just in a more draconian fashion.  Focus on the housing first, and then use the farms to aid in the healing. Why do we have so many homeless? cause they got no house!