The main reason I don't drive is that, due to a disability, I cannot get a license. There are other reasons but that one is trump. Where I live, I could survive without a bike but it would be a crippled life, especially regarding social opportunities. If I moved to a city, it would be easier without a bike but a lot of the same problems would come up, albeit less frequently. There will inevitably be a time when I have/want to go somewhere and neither walking nor public transportation are feasible and I can't reliable beg a ride from someone else.