I can see why people are leaving London at the moment.
However, for me, as much as London has changed over the pandemic, I feel more connected to my local patch of London. I know that where I am now, I have a network of friends, neighbours and even strangers who will help me if I get ill, and as someone living on her own, that security is priceless. I'd have to start again if I moved away.
Some people have been Covidiots, but a larger majority have been good. Really good. There's been an increased sense of community spirit, and for me, that's what I've gained to replace the culture-y things I've lost. Most of the culture-y things will come back eventually, and I think the community spirit will remain.
I don't know what's going to happen to travel within London. I suspect demand will remain less than before due to people working from home more often (I can see most employers offering part-time home-working in the future), so that might make the unbearable rush hour traffic more bearable, when we eventually have a rush hour again. I think no matter what desperate deal is brokered with the Government for funding, we'll still end up with the best public transport arrangements in the UK - possibly more expensive and less frequent than before, but calmer than before, so an acceptable trade off.
I've always loved London, and whilst aspects of it have changed - some temporarily, some permanently - there's still nowhere else I'd rather be.