FWIW, I think there's a lot more sections of the median that look like this than people are giving credit for:
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And this is on one of the most urban portions of the street, between Teall/Columbus and Westmoreland.
The city-county arborist's position might not be popular, but it's logical: trees are a lot cheaper than labor; they're going to plant as many as possible in April and November; if 50% die, they'll try again next year. Eventually, even with a 50% success rate twice a year, the canopy will be restored with self-sustaining trees.
Anyway, the state is most definitely going to use a contractor for this work rather than let the city and county handle it. These contracts typically come with a one-year warranty on plantings. Enforcement is key, but there's no reason they shouldn't get the majority of the young trees to take. If you look at a similar scale of project, the Connective Corridor, nearly all the trees are in terrific shape 6 years in. The contractor replaced some of the plane trees that didn't take in the first season with a hardier variety. The only exception are some of the blocks where SU oversalts the sidewalks in the winter.