In genetics, introducing random changes is one of the worst ways to find useful results. Admittedly, across such a large population, the virus might get worse,

In genetics, introducing random changes is one of the worst ways to find useful results. Admittedly, across such a large population, the virus might get worse, but if by worse you mean more deadly, then like ebola, it will restrict its growth by not transferring to as many people. If by worse you mean find another receptor that is hard to attack, then I'm not really sure what to do...