This won't help the people not infected. The most important thing as non infected person is still to wash your hands and not touch your face. Even if everyone wore a mask you wouldn't stop viral loads being spread by 100%.
As soon as you take of your mask and touch your face with infected hands it's over. It's no 100% perfect solution. And it would make people carless and probably wash their hands less. Which would cancel the positive effect of the mask.
Why do people act like wearing a mask and washing your hands are mutually exclusive?