!st of all most of those testing for a possible vaccine are looking at the same protein and trying to find ways to defeat the virus by way of the properties of this protein

In other words most are using on the same protein as the base of their efforts to develop a vaccine 

Considering we can't cure the common cold, HIV and numerous other disease what could go wrong

2nd what is considered a vaccine

Some thing like the Flu shot with an estimated plus or minus 50% of protection

How long will a vaccine last as tests show the antibiodies do wear off over time in those survivors of the virus, as blood tests have shown

But I am a bit worried  the  vaccine, if a vaccine is available, might not meet expectations

I am also worried we may be forced to take the vaccine