Putting aside economic incentives, which the wealthy were eager to reap, the vast majority of the technical labor force in this country came and still comes from (outside of SF) a specific race and we have huge incentives that literally everyone reading this has brushed up against, whether in support or against, to alter that racial makeup.
Obviously the only real solution to creating an artificial labor shortage is looking externally from the existing labor force. Simply randomly hiring underserved groups didn't really make sense because they weren't participants.
Where I work, we have two main goals when I'm involved in the technical hiring process: hire the cheapest labor and try to increase diversity. I'm not necessarily against either, but those are our goals.