I've read tons on this outbreak and there seems to be a point that the two sides (panic vs nothing to worry about) are talking past.
Yes, ebola is very unlikely to get any traction in the most developed countries due to a whole host of factors. However, much of the world is under developed and with sub-par health infrastructure. The world does not break down into west Africa and the western world. The most essential question is how well all the in-between countries would (will) fare: big cities in India, Egypt, Vietnam, Argentina, not to mention the various war zones across the globe. If ebola overwhelms these countries and their health systems (as it seems to be doing in at least 3 African nations), then what are the possible cascading effects?