Nothing will be “normal” again. “Back to normal” implies that the world would return to the state it was before the pandemic and fortunately or unfortunately this will never happen. You’re right, there will be some minor and some major changes on how we travel, work and look after our health. It’s a butterfly effect of sorts. Look at the samples from recent history: aviation industry has not “gone back to normal” after 2001, although it has improved somewhat in terms of the security. Brexit has caused nationalist parties popping up across the Europe. There’s been massive changes in banking since 2008 and so on... In short, a lot will change and we can’t quite fathom the extent of it until it all spans out.