But, and correct me if I'm wrong, but no virus has really ever done that? They have never somehow proved totally immune to the vaccines, because the make up of the virus remains very similar? That's why they're so confident. And then you're adding in that standard vaccine efficacy (for example a flu jab) is about 55-60%. These vaccines are hitting 85-90% after one dose. Also, you have to take into account how many people have covid and don't actually have a) any symptoms or b) anything more mild than a bad head cold. It's not to take away from the seriousness of it, it just shows that in the vast majority of people, their immune systems can fight it off without needing any help at all. So those people having a vaccine on top of that is going to help even more.
Now, that's not to say we don't have to be wary, but so far, every vaccine is protecting against every strain when it comes to preventing (or reducing significantly the risk of) serious illness. Infection is a different thing, but your body can get infected with loads of things - the immune system handles it. On top of that, you develop booster jabs - which they've said is already the plan - to target the people who need them the most (like we do with the flu jab, every single year). These boosters are developed to target the new strains (Pfizer already think they have managed to get a handle on how to reduce the transmission of the South African variant).
Your second point. I don't really get it? We aren't 'close to beating this thing' at all, until we actually take those steps? We can't beat COVID for good. It's here. It will be here for years. It's going to survive because that's what viruses do.
So, we develop medicines to manage it. We take gradual steps - which is what the roadmap has set out - and, the key is (which I'm not sure I trust the government on but I just have to hope they will do) is that they don't jump the gun and stick to it by any means even if the numbers shoot up. But when we take those steps matters little now the vaccine is out, because the virus will mutate and live on anyway. So even if we waited 6 months, and got every single person fully vaxxed up, the risk of a variant developing is still there.
In 10 days' time, I imagine there'll be a lot more cases. We're going to be testing 2 x a week in secondary schools and colleges across the country - people that were, by and large, not getting tested for the last 2 months, because why would they be, unless they were ill? It shouldn't be a cause for panic unless there is a massive spike - and then we have to hope that they make the right decision.