One of our former salesmen who has two young children and runs a daycare went car free about 4 years ago. I do not see him very frequently any more but last time I saw him he said it was working very well for him. Both him and his wife own Stromer ST2 they use Burley and custom made trailers. The also have a Spicy curry. He said he would never go back to owning a car. Madison is a very bike friendly city with an extensive trail system, much easier to get around with a bike. The weather is not so bike friendly but I know a lot of year round riders even with children. I see him riding around and he sure looks happy with his decision.
