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...