What happened with SARS? Was mask wearing mandatory?
SARS burned out - but I think mask wearing did more common in many countries badly affected.
www.bbc.co.uk/news/world-52015486
For many of these countries, mask-wearing was a cultural norm even before the coronavirus outbreak. They've even become fashion statements - at one point Hello Kitty face masks were all the rage in the street markets of Hong Kong.
In East Asia, many people are used to wearing masks when they are sick or when it's hay fever season, because it's considered impolite to be sneezing or coughing openly.
The 2003 Sars virus outbreak, which affected several countries in the region, also drove home the importance of wearing masks, particularly in Hong Kong, where many died as a result of the virus
We do a lot of public transport and anything that stops it being considered accptable behavior to cough and sneeze over people - I'd get behind.
However given that we have a much more individualistic culture in west I don't think mask wearing will stick around - it will gradually petter out as it slowly stops being enforced and fined for.