True. Face-to-face contact will never, ever be completely replaced by Zoom. Business travel has an important social component to it which is unbreakably connected to live interaction.
The fact that we have only known life for a couple of decades doesn't mean that it has started with our birth. It was there long before - and all sorts of diseases were an intrinsic part of it, often being far more dangerous and lethal than COVID-19. Neither of them fundamentally changed the nature of humans as social beings. And COVID-19 won't do it either. Ask some of those who are working from home now whether they would like to spend the rest of their working lives like that (and also stay put on their vacations and days off, effectively limiting life to the space between the sofa and the grocery store). The vast majority of those I know are actually very much looking forward to returning to the office! Even those who absolutely loved working from home in the first month or two miss their social interactions now.
The UK is uniquely positioned in many aspects, with London being one of those global hubs of everything. Without aviation, it just cannot function in its present way that ensures its prosperity. Think about it, how many world capitals can boast the same number of global headquarters or the same diversity as London? Not many! So, there is and there will be a lot to fuel that need for travel. And did I mention that not many of these people would be content to not seeing their families abroad ever again or spending all holidays till the end of their lives in good old Cornwall? So, the market is there. It's a matter of time for things to calm down and it will reach and exceed its 2019 levels once again.