There is a happy medium somewhere. I've seen cars with a hundred buttons, and that is just as big a disaster as a touchscreen. A good solution would be hybrid -- the things you use regularly while driving should be tactile buttons and knobs that you can hopefully recognize without having to look at them. There should be a very limited number of these controls; radio & climate being the obvious ones. The rest of the customizable features and such can be in a touchscreen and then only accessible when parked.