[quote=Vortex]
Hell, what if we can't developed new vaccines because the virus has become so evolved? Because the virus is so resistant to drugs?
[/quote]

It would take a long series of micro-changes for it to reach such a point. Where we should be advancing medically fast enough to keep up and have enough time of observation to beat the virus to it. There's still the small chance we might not be able to forever keep up an effective vaccine, but diseases save for a few like Cancer have been becoming very easy to counteract/stop. The main obstacle honestly being human beings who refuse to take the vaccines.