Even now many people can't be bothered. Yes queuing outside people do but once inside B&Q, Aldi etc it's just not happening.....at least where I am. Can you imagine walking down a busy high street after lockdown ends and trying to keep 2m away from everyone. Totally unrealistic to expect the population to do it. Heathrow have said social distancing at their airport is basically impossible. Not sure what the solution is though
until the vaccine is available (next 6 months fingers crossed)