You'll never have the option of even the most advanced driverless car that you own take you home if you're drunk. No way the DUI industry let's go of that kind of power. There is just too much money to be lost. As I've read here and other places, they can, do and will arrest people and convict them for just sleeping while intoxicated in a parked car. Hell, I've heard anecdotes (which I have been unable to verify) of people being arrested for just having keys and accessing the interior of the vehicle while drunk. No way having the real life version of KITT is going to stop cops from making their arrest quota.

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"I'd like to live just long enough to be there when they cut off your head and stick it on a pike as a warning to the next 10 generations that some favors come with too high of a price." -Vir Cotto Ba