Not sure I've seen any scientific evidence to suggest that it is a guarantee. The consensus among scientific advisors is that we don't have enough evidence to make definitive statements.
Very true but the thinking is on the worst case scenarios as it always has been. Which is fine, better to be over prepared than under prepared.
But I stand by the thought that a 90% vaccinated population and all of the weeks of data from South Africa that we do have. That this new variant won't emulate the alpha version when the world had no antibodies. Just because more people may catch it doesn't make it more dangerous , as there is still a big gulf between weekly cases and weekly admissions, due to the vaccine.
But that is the worst case scenario, that despite being told repeatedly about the more milder symptoms and lower admissions and all the rest of it. That we will still could potentially end up like we were at day one of the pandemic.
I refuse to believe that 90% double vaccinated population can hit those figures. I also believe that the data in terms of hospital and deaths over the course of the winter will not be different no matter which variant is involved , those who will catch it and get seriously ill will do so no matter which version they catch.
Which is why I say measures should have been put in place on July 19th for the winter rather than a reactionary approach as we have saw. It's not the what they have done but the why.