You're screwed, is what.  Some prototypes for the Apple Car had no steering wheel - !! I'll bet pilots have (let's say ...) "strong" opinions about replacing knobs with touch screens.  Looking at this pic of the A380 cockpit, I imagine rephrasing that line of Jack Nicholson as the Joker: 
Where does he get all those wonderful knobs?
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Beyond that ... buttons / knobs are safer and drivers seem to prefer physical controls (see Wired link I posted earlier -- 89% surveyed "preferred physical buttons.")  I imagine that the screen-preference folks are not driving enthusiasts and just want what looks "good" and works well enough, and -- they are used to their phones / tablets.  But it wouldn't take long, I'll bet, for those owners to miss knobs for volume, for interior temperature / fan, etc.  The idea of digging through menus, noooo...