Over a century old idea promises bright future

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Story: Fox News: California Utility to Capture Solar Power in Space
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Why does it have to take over 100 years for the humanity to take advantage of good ideas?

PBS: Tesla - Master of Lighting
More than 100 years ago, the Croatian-born American inventor Nikola Tesla demonstrated transmitting electrical energy over a distance.

In 1900 "Of the 4,192 cars produced in the United States 28 percent are powered by electricity, and electric autos represent about one-third of all cars found on the roads of New York City, Boston, and Chicago."(PBS Timeline: History of Electric Car)

What other good ideas are still laying around not used to their full potential for whatever reason?