Could modern, nanoscale vacuum tubes replace transistors?

Vacuum-Tubeshttp://www.extremetech.com/wp-content/uploads/2016/06/Vacuum-Tubes-768x425.jpg 768w, http://www.extremetech.com/wp-content/uploads/2016/06/Vacuum-Tubes-640x354.jpg 640w, http://www.extremetech.com/wp-content/uploads/2016/06/Vacuum-Tubes-672x371.jpg 672w, http://www.extremetech.com/wp-content/uploads/2016/06/Vacuum-Tubes.jpg 1344w" sizes="(max-width: 300px) 100vw, 300px" />Could nanoscale vacuum tubes replace transistors in future devices? Caltech thinks they could, and it’s building proof-of-concept devices without the leakage that plagues modern hardware.
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