In the US there are already many urban places that have 'community' boxes. The practice is obviously much more cost effective for the postal service. For individuals, it can be a problem. My sis had to rely on her neighbor bringing her her mail; asking that favor bothered her a great deal.

Rural areas have individual mail boxes- but because they are at the street or road, they are often the equivalent of half a city block away from the front door.

In apartment houses, a line of community boxes (indoors) is standard.

Like most/many people my mail box gets little use these days. I use direct-to-the-bank check/cheque service, and most of my communications are done by email and cell phone.