Studies seem to be pointing to the outcome that any vaccine will not impart lifelong immunity, but will only offer protection for only 5-7 months.
This increases the likelihood of Covid-19 becoming endemic, joining the four other endemic human coronaviruses (229E, NL63, OC43 and HKU1) which circulate indefinitely within the human population.
Which means that the discovery and distribution of a vaccine will not be the endgame solution. Covid-19 will likely remain with us for the foreseeable future, with occasional and localised outbreaks that hopefully do not overwhelm available medical resources.
The role of treatment and therapeutics will therefore be of primary importance as we learn to live with this virus.