Ground level storefront shopping has died a quick death, but I have often seen them converted to offices for small business/freelance/remoting and the outcome is nearly as good. They do not increase walkability much (that should be taken care of by a corner supermarket, a parcel receiving machine and public transport), but it works surprisingly well to keep the "abandoned city" vibe away that haunts purely residential areas during working hours.
In my area, there is an ongoing resurgence of ground-level storefronts with residential over.[1][2]
In both cases, at least one of the rows of homes is actually large condo units on top of ground level retail space. The homes in both developments are selling quickly and in the first, the retail spaces are also condo (owner operated, or whatever you'd call it). It appears to be a mix of light food (coffee shop), retail, a fitness studio, and some small professional offices.
the other significant benefit of mixed zoning is that the city doesn't concentrate office space into pockets and breaks up peak hour travel across multiple directions and locations.
