The biggest use of some kind of driver assist system is something that can keep me going straight and at a constant speed on a relatively open road while I twist open a bottle cap and take a sip of a drink. Making me have a death stare out of the windshield to avoid disengagement is about as useful as standard cruise control. Except standard cruise control isn't going to be prone to making a mistake about whether or not I'm paying attention, and then stopping my car because it isn't satisfied.