yes the US.UK are at 50% rate. rest of the world, about 25% have had 1 dose. so your reasoning for opening up doesnt add up.
ive got no issues with the vaccine preventing hospitalisations, its the transmission part
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I know it has been said from the start - by people who do not know what they are talking about.
"Running its course", for this disease, with an R0 of 3-6, an incubation period of 1-2 weeks, hospitalisation rate of around 10%, with around 10% of those in ICU, and a 10% of them on ventilators and an average hospital stay before discharge or death of 2-4 weeks and a case fatality rate of 3% means the collapse of the country's medical system, a massive increase in deaths, a really major recession, and very likely political collapse. And it will drag on much, much, longer, partly because far more damage will be done, and partly because allowing large infection populations allows variants to evolve - and one of the major selection pressures is infectivity, so we find that the Delta variant is about twice as infectious (R0 doubled) as the original strain.
No country in the world has actually let it "run its course" except perhaps North Korea (and who knows what is really going on there). Some countries have tried to deny its impact while doing a bit of token action - you can identify them by the high death rates and economic problems.
This is exactly the same as the last really major pandemic in 1918-1921, with the notable difference that this one spread much faster due to better communications, and we have several very effective vaccines that are going to see those countries that behave sensibly come out of it in a lot better shape than a century ago.
A tale of two States.;
Zero cases, but another week of masks as we wait for one person to be happy (inqld.com.au)
New lockdown rules in NSW;
Sydney in limbo: Premier's admission about lockdown length (thenewdaily.com.au)