Sleep The Scandi group of countries have a much lower death rate than countries with similar policies
Sweden without lockdown is comparable to the UK
The other Scandi countries with lockdown have v v low death rates
So we can already get an idea of the difference lockdown makes
However, even if relaxing lockdown restarts exponential infection growth,
some countries may choose to pay the cost in lives, rather than wreck their economy with a 2nd lockdown
If a 2nd lockdown if it doesn't work, then probably every remaining country will be forced to accept the deaths
Vaccine rollout is too far away
Lockdown was a partial pause button,
to give time to build up the health service, mass testing, contact tracing etc and to start improving treatments
Hopefully that time has not been wasted, because we probably can't have it again