I've never considered giving up my driver's license. I like to go out to the mountains for various activities, and even if I'm not the one driving there's a chance the driver will feel too tired to drive. I've taken the wheel on several such occasions, and I'd hate to make someone drive when they don't feel safe doing so.
In addition, I'm probably one of the least dedicated car-free people on this forum, and I'll rent a car when I feel it's necessary. I promised myself that I wouldn't compromise my social life or hobbies for the sake of being car-free, and sometimes that means temporarily using a car.