They can't force anyone to take a vaccine.
Vaccine development isn't as easy as some people seem to think it is. They don't just throw together the first concoction that comes to mind and stab people with it. There is a lot of research and testing involved. There are much easier and quicker ways to make money, if that's what you're suggesting the upside to an Ebola vaccine would be.
But really, at the end of the day, give me potential vaccine hazards over Ebola. Easy decision.