There is no way that a land cruiser owner in Africa will ever consider anything made by Ford. That's like blasphemy. The LC has decades of proven reliability, that the bronco needs to compete with.
It's true, the Ranger is immensely popular. But Ranger owners and LC owners do not see eye to eye and you'll have a tough time convincing the LC owner to change allegiance.
For South Africa specifically, the Ranger is about as large as you can go in terms of personal vehicle, before it becomes a serious hassle. Our infrastructure does not really support bigger cars. How does the bronco compare with the Ranger size wise?
Lastly, the Ranger is built in South Africa, I think Ford knows and understands the Southern African market very well.