I think the crucial technology which would make such cities practical in the future would be innovation in transportation, whether that be something like latera

I think the crucial technology which would make such cities practical in the future would be innovation in transportation, whether that be something like lateral elevators for short distances (of course "elevate" may be a misnomer here), or hyperloop for longer distances. Building vertically has the benefit of squeezing more utility out of land area, but has drawbacks which can make city life less comfortable.