What's the plan if there is no vaccine? Repeated lock downs forever?
The only way to control new infections on a low level (in order to be able to track and trace) is distancing, masks, hygiene and room ventilation. If a society decides to not follow that advice - then yes,
but not forever obviously.
Our short term hope in Germany now are antigenic rapid tests
to protect the vulnerable group in hospitals and care homes.
About 3% false positives and 20% false negatives is more than PCR tests, but still very helpful
to detect many positive cases who otherwise wouldn't have known they are positive, and isolate. A huge factor.
We can only go step by step
and always react early, controlling the curve
(which is a basic human problem to act BEFORE most people do see a problem, before the house is burning. Politicians have to "sell" early measures and will only be said to panic by people inable to look a bit ahead...).