The truck wouldn't need to slow down (let alone stop), multiple drones would give high utilization, and you could further optimize delivery routes by "crow flying" to houses that aren't even on the same street.
https://www.inverse.com/article/43043-ready-player-one-drone...
- that book was set in a shitty gig economy dystopia, even if the main character managed to personally get rich in the end
- that book was fucking terrible and it's frankly embarrassing that grown adults make reference to it in a positive manner
You still avoid the inefficient stop-and-go driving and the time-wasting "last 100 feet" walk. Sure it's not as superior in rural areas vs suburban, but with low enough overhead you could still beat the traditional truck.
Naturally if the drone gear cost millions of dollars and took up half the truck, then I'd agree it wouldn't be worth it. In reality I don't think that's the tradeoff though.
UPS demoed an interesting "roof mounted" hardware approach (ignoring the rest of the operational depiction): https://www.youtube.com/watch?v=TYBu2glKHTA
Can you share why you think it makes sense cost wise?
A truck gets that for free via tyres and tarmac.
Air travel makes sense for high-value and time-sensitive payloads, most especially passengers, but also communications (airmail delivery was, and remains, a significant revenue source for airlines).
Fixed-wing drones (as Zipline uses in Rwanda) are more efficient than rotary craft, as forward velocity generates lift, though at a cost of being unable to hover, which makes point delivery to locations lacking a landing strip (or other capture device) more challenging. Zipine utilises parachutes (and lightweight cargo) for its deliveries. Pivot-rotor craft (which Zipline seems to be experimenting with for urban deliveries) make hovering more viable whilst preserving the efficiency of fixed-wing flight.
I still see this as an option with very limited applicability.