I think everyone's version of the world being 'back to normal' is different. At the same time you hear people saying 'we'll never be back to normal, as before' - This is probably correct, but not in the massive hyperbolic way they say. When the world is normal again people will be more wary of cleanliness and a few may wear a mask when they're ill as a courtesy, or some may avoid going in to work as they now understand how things like this spread. Whilst all of that means technically the world will never be how it was, that's not what that hyperbolic statement implies.
Back to my point of each person having a different view of normal, or almost normal. Most people have a clear drop in expectations in general currently due to a lack of things to do, so for some people being able to see their friends and family is enough for them to see it as almost normal. Some people though might view it as pubs without restrictions, clubs allowed open and barely any restrictions (Maybe face coverings on public transport and the like just as a safety net).
The headlines today have said that we may return to near normality in summer seem to have gained a lot of people moaning that we're not gonna drop restrictions before summer. Firstly it states that things will be released gradually, so the point is that by summer we will be at the end of the gradual release. If you thought we were just gonna drop everything and have no restrictions as soon as the over 50s are vaccinated then i'm sorry, but you're f***ing thick.
There seems to be a good chance that we will have very little restrictions in the summer(In the UK), closer to my 2nd scenario of someone's normal in the paragraph above and I think most people would be relatively happy with that. These people moaning need to understand the language of how things are put across, how to interpret it and that nothing will be absolute currently, no expert wants to be seen as doing a Boris by promising something that can't happen, being precautious with public health is their main priority.
For example when a trend is heading one way and it can clearly be seen that in 99.99% of possibilities it will end one way, someone like Chris Whitty will always caveat his statement by telling everyone that this isn't a promise and things can change because getting it right is more important than giving incorrect statements. Now take Boris Johnson, he's the opposite and will absolutely promise that something is gonna happen when it's a 50/50. 5/10 Boris Johnson will be wrong(probably more so as a 50/50 with Boris in charge is immediately weighted against you), Chris Whitty will be correct 10/10, as he promised nothing and caveated it, yet he seems to be the one that takes the pelters because he wasn't upbeat about it. If you interpret those two things of BJ promising me something with no data to back it up or CW telling me something should happen with all of the data to back it up, i'll take CW every time.