The evolution of Covid 19 wants to become less deadly as a survivor of the fittest tendancy continues and there are probably 100 variants of the virus at this time. The fluidity of the situation can complicate vaccine development. So it is not news that unknown paths complicate matters as Mr red sez. Or we could get lucky if someone doesn't make things more difficult.

Mr. Trump has a hunch that nuclear weapons are also effective in eradicating the virus. A stable genius would attack the virus at its source which is China. However the virus is now more prevalent in the USA, so who will he attack? China or Blue States or both? Putting ignorance aside
I lean toward a vaccine. ;^/