Great to see the gloom-mongers are finding a new thread to sink their teeth into.
2-5 years, immunity doesn't last, mutations, vaccine doesn't work against new strains.... 
What's the goal here - total eradication of Covid virus, or stopping most people dying? Because they're not the same thing.
Even Chris Whitty, who is the most gloomiest gloom merchant around had a chart last week showing the age spread of people who had died, set against the groups being vaccinated. Take away from the graph was that once over 50s are done, deaths will be tiny. Once groups 1-4 are done (think that's the over 70s) deaths will reduce hugely.
Reports this morning are that the AZ vaccine might not be effective against people getting mild symptoms from the South Africa strain. So what? People get mildly ill. Big deal. The hospitals won't be overrun with Covid patients and in the very unlikely scenario that they need treatment in hospital, there's loads of space.
And as for the "immunity doesn't last" there are already plans for the vulnerable to have an annual Covid jab along with their annual flu jab if that's needed.
Numbers are falling like a stone across the UK. We have vaccinated TEN MILLION PEOPLE and that's something we should be applauding, not bitching about.
Sorry doom mongers, we know how much you've loved the last year staying at home having quality #makingmemories time with your pre-shus famalam. And twitching your curtains about people leaving the house, sitting on park benches and all the rest of it.
Unfortunately you're going to have to find something else to fill your sad, empty little lives now, as the rest of us are seeing light at the end of a very long, miserable tunnel and can't wait to ditch the masks and get back to seeing people.