there is always a risk that Ebola, or some other virus or bacteria will find a better transmission route through a mutation or a chain of mutations, as it adapts to new hosts, kind of like Yersinia pestis. read more
Ebola and Marburg viruses are examples of dumb viruses, they end up killing their hosts within 3 weeks of infection. The problem with dumb viruses is that after 3 weeks, they have no host (if it does kill the host), the virus stops replicating, and subsequently dies with its host. read more