We have to do things differently if we want different results. I remember a time when the entire student visa review process was conducted in Dakar. Everyone had to travel to Dakar, which made matters difficult for a great many students.
If we want to target sub-Saharan Africa, which, once again, represents a potentially large pool, we have to acquire the necessary tools.
You mentioned the possibility of increasing the number of visa offices. I'm not an immigration expert, but I can tell you that, when you want to serve a clientele, it may be a good idea to move closer to it. That may be one way to view the matter.