the reality is no one knows - and the biggest thing that no one knows and that we quite quickly need to is how many people have had mild or asymptomatic cases that we dont know about: how huge is that iceberg underneath.
That should be really the priority because if you dont know that how can you work out any modelling as to how long it is going to last.
How many people have had a virus in this time that hasnt been awful enough to definitely be CV but could be?
We cant lockdown forever, indeed I suspect at some point the negatives of staying on lockdown outweigh the positives in terms of the longer term future - something I suspect Governments are well aware of and dont say.
www.imperial.ac.uk/media/imperial-college/medicine/sph/ide/gida-fellowships/Imperial-College-COVID19-NPI-modelling-16-03-2020.pdf
Actually reading this is interesting because it actually says this about September
*Once interventions are relaxed (in the example in Figure 3, from September onwards), infections begin
to rise, resulting in a predicted peak epidemic later in the year. The more successful a strategy is at
temporary suppression, the larger the later epidemic is predicted to be in the absence of vaccination,
due to lesser build-up of herd immunity. *
Instead it recommends this:
Once interventions are relaxed (in the example in Figure 3, from SGiven suppression policies may need to be maintained for many months, we examined the impact of
an adaptive policy in which social distancing (plus school and university closure, if used) is only
initiated after weekly confirmed case incidence in ICU patients (a group of patients highly likely to be
tested) exceeds a certain “on” threshold, and is relaxed when ICU case incidence falls below a certain
“off” threshold
They seem to think this initial period will be 3-4 months hence the Gvt saying 12 weeks
December wont happen though because that would create a pressure cooker - the impact of letting it go would be immense. This has to be a slow simmer of on and of