Why mutant airborne Ebola is "highly unlikely"

Why mutant airborne Ebola is "highly unlikely" HT: Crof.

Via her blog Pathogen Perspectives, Heather Lander explains Why Ebola Airborne Mutation(s) are "Highly Unlikely": Let's Talk Mutation and Natural Selection. Excerpt:

... there’s no selective advantage to becoming airborne for Ebola. It is clear that Ebola’s current mode of transmission is working well. The virus is spreading and reproducing successfully. This means there is no selective pressure on the virus to keep any mutations that might confer airborne transmission, especially when this kind of significant change would most likely bring with it some serious deleterious side effects. 

And while some argue that this is the first time Ebola has been replicating to this extent in humans, we need to keep in mind that it’s been doing this for far longer in the wild in the primate species it infects and in its bat reservoir host. And yet, this mutation hasn't happened.  

So, can we say it's impossible? No. But I'm not losing any sleep over it.