Lastly, cargo bikes are used for much more than just transporting kids, it isn't rare at all to see them used to haul groceries in quantities that would never fit in pannier bags. My s.o. vastly prefers the cargo bike over her regular bike with heavy loads, both for stability and for hauling capacity, even if it is a bit slower than the regular one.
Five to six year olds are the hard case: technically too large for a regular bike seat, but too young to be in traffic. Having two of these quickly maxes out the carrying capacity of a normal bike, and when parents 'bikepool' taking neighbours kids along to school you regularly see a parent with up to four kids in a cargo bike, a feat you'd never manage on a regular bike.
As for the SUV: those things shouldn't be in city traffic to begin with.
Still better than cars though, maybe I should just take a car spot...
That's exactly what I do when I use the cargo bike. Usually when I come back there is another one using the same spot :)
I'm hoping for this to be institutionalized where car parking slowly gets transferred into permitted bike parking.
Most of the time I see people carry a single child or a bag of goods at best. Quite similar to how often people use SUVs for actual offroad riding, like never. Don't get me wrong, if you are transporting stuff on a daily basis these are great. But it seems for the majority of time a normal bike plus backpack or child seat would have been sufficient.