Should positive action schemes be used when hiring for senior roles?

Targeted recruitment towards demographics is more common for entry-level positions, with far fewer organisations seemingly willing to implement a similar approach for management or executive jobs. Is there a case for this to change?
C Suite Positive Action Scheme Illo Sm

Diversity, most modern and forward-thinking businesses appear to agree, matters. Being able to draw on a range of backgrounds, experiences and expertise is useful for coming up with different solutions to the same problems, as well as offering multiple insights into market or client opportunities. 

There is only one black CEO in the FTSE 100

Is a product or service suitably appealing to someone from a particular demographic? It’s easier to answer such a question if you have someone from that demographic working among your ranks. Research by the Harvard Business Review found that companies that are diverse in their employee composition are 70% more likely to reach new customer bases than firms that are not.