Honestly, I expected it to be impossible.
The stuff that’s already buried was put in as the city was built, and all easements and rights of way were baked into development.
Burying new stuff en masse would require new easements and that would either require negotiated payments or eminent domain and the legal fights that come with it. Even if they managed to get all the land rights needed, there would be a decade of torn up streets, sidewalks, back yards, etc to deal with before it was all buried.