Lots of people are going to die. Potential loss is 5-6b.
All 7+ billion humans will die, no doubt about that.
There are 7 billion people in the world, so you could say the potential loss is 7 billion. A much more realistic number is between 1.4 and 3.3 billion people, and that is pretty close to an absolute worst case. Ebola is like movie zombies - very slow moving. If we (okay, not "we", not with Obama leading our country, but Europe, Japan, and other countries with capable leaders) can't respond in time to keep the numbers well below 1.4B that would be shocking. The totals will be terrible by the time this outbreak disappears, but I don't expect anything near your number.
Hey Obama, be a MAN - Implement a travel BAN!!