Hopefully this will be the case.
However, the vaccine will only be effective if it can cause a significant enough response by the adaptive immune system. The live virus seems to cause quite a weak response by the adaptive immune system in most people because they only get mild symptoms for a few days. Maybe that is because their innate immune system works well, but vaccines rely on the adaptive system being triggered to make antibodies.
The lack of effective vaccines against other coronaviruses like sars and mers is what concerns me, which suggests that the immune memory response is not very long lived and protective antibodies may only be present for a couple of years at most.
Not only that, but if this thing behaves like some other viruses such as influenza, rhinoviruses and other coronaviruses then it might mutate sufficiently to avoid the body’s immune memory anyway.
It’s a devious bug this one, and personally I’m a bit concerned that the “lockdown exit strategy” is betting on the availability of a vaccine that may not work, or may not work for long. There is too much talk of a second peak and that it must be avoided...but the reality is that this thing will probably return either because our immune response wears off or because it mutates, and so a second peak or second wave is not really avoidable.
Obviously I hope I’m wrong here.
There is a SARS vaccine.
It may be that you need a series of doses and/or boosters to get titers up. This is why we do the trials and why it may take a while to get an effective vaccine.