My city subsidized buying cargo bikes in two waves, there's a lot of them now on the streets. Delivery services use them too quite a bit. Thing is, i don't think our infrastructure is spacious enough in many places, i hope this will force the city to update it.
Transporting kids is surely much more fun in a cargo bike, but i think for many people a good old trailer would make more sense really. Much cheaper too and you're probably able to put it in the basement if you live in an appartment.