Those have already existed in the US for a decade or two. They are called Walmart Neighborhood Market and they are basically just a regular grocery store.
Our Downtown area is replete with miniaturized grocery stores, pharmacies, and other amenities that are built into the landscape there. They have sprung up commensurately with the addition of loft-type housing and other developments which are actively luring middle-class workers to live there again, after a long period of rather blighted and lifeless downtown environs.
Back in 2008, my fiancée flew out from Catalonia to visit me, and we went on many outings using rented bicycles and public transit. One Saturday, I took her to see some museums near Downtown, and we transferred in Central Station, which was more or less deserted, except for some very brave pigeons. She looked around and she was downright incredulous about the lack of passersby. I told her this is totally typical because nobody views Downtown as a place to hang out or be entertained, it's a financial and business district where people go to work and then GTFO to their suburbs.
In Europe it is very different for her: typically people live and work right in the city center, and the suburbs are something else entirely.
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