Perhaps we could look at this issue from another angle. There's currently no vaccine for HIV, hepatitis C or other coronaviruses because research stopped after the respective epidemics were over. We also don't yet know whether people can develop natural immunity to COVID-19 after contracting the virus.
What makes you think that it's possible to discover and distribute a vaccine for COVID-19, especially since we don't know whether we can develop natural immunity? In addition, if we can't develop immunity, could this factor affect the quick development of an effective vaccine?