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The reason why this happens all the time is the huge gap between inventing something and making it cost effective. That might be materials cost, low manufacturing yield, liability, or any other money-based reason. All sorts of wickedly cool inventions are out there but not yet "reduced to practice."
I'm still expecting full-electric brakes on passenger cars (no hydraulic fluid at end-of-life, less unsprung weight, faster maximum braking) and steer-by-wire (no steering column to damage a driver in a crash, even our modern collapsing style is not great) but I'm not holding my breath. Those technologies are nearly mature but the liability issues are huge.
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