A vaccine doesn't erradicate flu, no. It does really risk the chance of getting a serious case of flu though - which means we don't all have to social distance or isolate in the same way at that point. I don't think that many people do blithely accept. There is a huge difference in approaching something based on the knowledge you've got and blithely accepting. There's research you can do yourself (lots of studies have at least some information available to public).
As someone who has lived the experience of a family member with an attachment disorder and early trauma alongside personal experience of trauma, the lack of communication you're talking about OP is a very different reality. Most children have some contact with those outside families, definitely families and usually are at school. They have a loving attachment with a parent who responds to them and talks them through worries and a parent who is aware that this situation is not ideal, who can support them when there is a clearer plan in place. They are not likely to get ill from less friends round after school.
We are in very early days. It is not clear a vaccine won't eradicate it, just highly likely. It is clear the first vaccine won't eradicate it, but it will improve the safety of socialising and lower risk.
It is just lightyears away from abuse. It's actually quite offensive to make such a blase comment for those of us who have personal experience of abuse/neglect/trauma. Your child cries and you pick them up, you gave them the gift of making faces at them as a child so their facial muscles developed, you cuddle them and make sure they're fed and warm, you respond to their worries and comfort them. That is NOT abuse or neglect. Abuse causes children who stop crying, who suffer deep shame, who sometimes are so neglected their facial muscles don't develop normally, who can't control food intake as they don't believe they're going to be fed again and are set off into fight/flight mode from something as seemingly innocuous as Santa. Lack of real communication and a stable, single carer (parent or otherwise) in infancy/childhood causes attachment problems that are really hard to work through and prevent a child being able to accept love from another person, or even themselves. Please don't use the term abuse lightly.
Equally, most schools at Primary level are not encouraging teachers to wear masks (at least in my area) to aid the children continuing to learn speech more easily and be able to read facial expression. That is love, teachers putting themselves at risk of Covid so our children can learn that bit more easily and feel more at ease. That's something to be very grateful for.
Actually, as a thought (meant kindly), do you think you might be feeling a bit overly low? It's quite a big reaction to the Covid rules and maybe you're just feeling a bit too overwhelmed? Things are very likely to improve and, yes, it may take time, but we're all in the same boat. The foreseeable doesn't have to mean years and years. We aren't all terrified of Flu, we just go and get a jab if we're at risk or able to pay. That is likely to be how it is in the future, although it will take time to get there. We're very very early on, it's only been since March! I don't think BJ is helpful at all, as he keeps giving all these 'over by Christmas' comments, which most of us knew were utterly twallop. However, it doesn't mean the vaccine will be continuously ineffective or that research will stop once the first vaccine is produced.