Virus: possible next mutation?

How do we know that the current virus is the final stage of its evolution? Do things actually ever stop evolving? In its current state, its only communicable through the saliva or bodily fluids of an infected individual. Given time and maybe even a host with a different blood makeup (diabetes, hemophillia, HIV, sicle cell enemia etc), could it be possible that the virus could mutate further? Maybe even to an airborn virus?

Also, we know for a fact that there are people in the world that are immnue to certain diseases. Conceiveably, there would be a small percentage of the world that do not suffer any symptoms of a disease, but still could carry the virus. The people next to you in your 'safe' house, could very well be as deadly as those banging to get in.

Also, the Campion virus allows the brain to function even after death of its subject. Its possible that this has a certain scientific relevance. Could the virus be used to animate brains enough to operate other things? Does the reanimated brain have to stay in its original body, or could it be wired to something else? I know this is more science fiction, but stranger things have happened behind closed doors with the science we already have.

Basically im asking this. What does the future hold now that the world has been exposed to such a rule breaking disease?