COVID-19 will never be gone and will always exist with us even with a vaccine, the only difference if we'll be vaccinated by a 100% working vaccine is that we'll be immuned to the virus and will no longer be affected by the virus. The only question is that when will we have that kind of vaccine, next thing is the fund needed to buy the vaccine, and the last thing are those people who are not willing to be vaccinated because they are too afraid that they might become a lab rat.
Anti-viral vaccines can never be 100% effective, since the virus mutates very quickly. Any vaccine with more than 60% efficiency can be considered useful in the fight against the pandemic. The vaccines from Russia, Pfizer and Moderna have efficiency of around 95%, while the cheaper vaccine from Oxford/AstraZeneca has an efficiency of around 70%. So it is confirmed that these vaccines can eradicate the curse of COVID 19 in a matter of few months, once the vaccination program starts.