It ends with immunity / mutation / therapeutics.When will we be back to normal?
Ignore mutation for the moment.
Immunity: Complicated because it's not just antibodies but the epidemic is shaped by it, for example there have been no outbreaks in London or New York since the Spring (yet it probably will change). However to stop community transmission we need a vaccine. The Chinese vaccines are almost there. They are the 'safest' imo because with one exception they use traditional inactivated virus which are well understood whereas many of the Western vaccines use newer methods. Politically its unlikely the West will want to use vaccines developed by the Chinese so we are reliant on:
Oxford vaccine - trialed globally but largest trial is in the US.
Pfizer vaccine - trialed largely in the US
Moderna vaccine- trialed solely in the US
The leading candidates were the Oxford vaccine and a vaccine from Pfizer which were expected to reveal results in October. However for two weeks the Oxford vaccine trial has been suspended in the US because of two adverse reactions in the UK which may or may not have been linked to the vaccination. The UK regulator has allowed UK trials to continue but the US regulator has not. Meanwhile, an early emergency use authorisation in the States looks unlikely because its being reported that the US FDA (their regulator) will extend the minimum trial period for the vaccines. This has not yet confirmed but it likely stems from falling US public faith in vaccines as they have become politicised by the US presidential elections.
In short, vaccine timetable has just been pushed back to December. This is just opinion and should not be taken as fact. The US political news has yet to be confirmed.