The fact that it is hard if not impossible to develop this style of neighborhood is still a problem.

Every passing year is another one in which old buildings are redeveloped and the US population grows, increasing market pressure.

Sometimes that old building is a tire shop and the new building is a 5 story apartment with ground floor commercial space, though.

I’m never all redevlopment is bad, but if part of the old parcels are the nice walkable shops and nearby residences, and we don’t really allow new ones, then it’s going to be a predictable net loss. A lot of these locations are grandfathered in and would not be allowed under their current zoning regulations.

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There’s a separate issue with new modern mixed use in the US where retail tends to have low occupancy. Partially this is because there continues to be a massive glut of retail space in the US, and partly because the new spaces tend to be too large to be profitable for anything other than chain stores, and there are only so many chain stores to go around.

Take a street like melrose ave. It's filled with pretty well leased, single story commercial real estate abutting low rise apartments and homes. Walkable? Sure, if you manage to snag one of the limited available leases in a 15 mins walk. Replace those commercial parcels on melrose with 5 over 1s, and there is no net loss here. The same commercial square footage is available, sometimes more if the the building extends further into the lot versus if the old building had a small surface parking lot in the rear, sometimes a lot more if more than 1 story is set to be commercial space. Not to mention the apartment stock swells up, supporting a larger customer base for these businesses when these apartments are inevitably leased out before long.

NIMBYs in this city bemoaned old Amoeba records loosing its "historic" low rise commercial building. But Amoeba just moved into one of these mixed used developments a few blocks away closer to the metro station, got more square footage out of the deal, and sold the old property for a lot of money. The city changes and it isn't a bad thing, in fact its typically a good thing that it changes as this keeps rents closer to the actual wages seen.