> What are the disabled supposed to do?
Golf carts. Electric wheelchairs.
> What about those with infants?
Definitely don't put them in cars. They're the leading killer of children, nationwide. If you care about your baby's safety, you'll put it in the car as little as possible, only when there are no other options.
> What happens if you are carrying groceries?
If you have children, then under the stroller. Or in a bike trailer/stroller combo. Or foldable personal shopping carts - I always see little old ladies with those. Or a rucksack.
> What about those with bad knees?
E-bikes with throttles. Or trikes. Or golf carts.
> What happens on the day when all the bikes have been borrowed and there are no options but a cab?
How likely is that?