Your cliche about it being totally small towns doesn’t really wash for the 40 years of outbreaks , and why aren’t millions dead now, infact, why haven’t millions died in the past?
There haven't been continuous outbreaks for 40 years. There have been maybe 10 to 15 outbreaks (if that) due specifically to people eating or coming into contact with animals that have the disease. After that it spread from person to person. Not a lot of people eat chimpanzees which was suspected for a couple of outbreaks. Others have to with bats.
And again it struck in times and places where travel was limited. Not like now.
But let me ask you a question. Why do you think it will NOT kill millions at least in Africa? What is going to stop it? There is no cure. It's not contained. The healthcare systems have collapsed. The economies are near collapse and people are still traveling. What will stop it from killing millions?