short of it going airborne which ... is extremely unlikely. And if it were already airborne, we'd all already have it.
To start, let's ignore the first part of your statement and focus on the second part. If the disease is airborne, we're looking at an immediate 60-75% reduction in the world's population within 3-6 months. It'd be very, very bad. This is where all the fearmongering is coming from.
Now, let's look at the first part. As far as we know, the virus has not evolved significantly since its first discovery in the 70's. The virus has also been observed to mutate fairly slowly. This is good news. In addition, there are several major hurdles for the virus to overcome in order to become airborne. This is very good news. These two things put together means that the chances of the second part of your statement happening are very, very low.
But really, we need more data. There are too many unknowns right now. We can't tell if the incubation period is trending upwards, or if the mortality rate is trending downards. We don't know if the infection vectors right now have changed in any meaningful way. We suspect not, and there are very good reasons for this. But quite frankly, if they have, then we're a step closer to getting into trouble.
Quite frankly, sending troops to Africa would be useless. Sending doctors might would be of limited use as well, giving sanitary conditions and the way many people treat doctors trying to stem the outbreak. But researchers and scientists, those may be beneficial in more ways than one. Have them go into every village, town, or other isolated population (e.g. each building in a large city) and get bloodwork from everyone. And if anyone in that population is infected, have the local military quarrantine the whole population. And then send the positive blood work back for analysis.
It's a bit cruel (the researchers would be letting entire villages get infected), but given the state of mistrust between the common people and officials trying to manage this outbreak, that'd probably happen anyway. This way, at least clean villages and population centers would likely remain clean. And we'd get some much-needed information on the virus that could be used either to combat the fearmongering, or prepare for civilization meltdown.
Actually, there are several treatments in various trial stages that seem to be effective. So even if the outbreak spreads significantly to the point where much of the world outside of western Africa becomes afflicted, there's a good chance we'd be ready to fight it. Chances are, we'd be looking at a week or two of lost productivity world wide, rather than a genetic bottleneck event.