As the parent comment states, the question isn't will Ebola completely change it's infection vector to become airborne. Someone who has Ebola today can cough blood. If you become infected from someone coughing blood on you, does it matter that the infection came from the blood on their breath or from virus on their breath?

It seems that virologists are answering the wrong question and getting caught up on semantics, perhaps to prevent more hand wringing and panic.

Edit: removed statements about Reston, as they seem to have been remembered incorrectly from Hot Zone, the book about the primate-only Ebola outbreak in Virginia in the 90s.