Back in the 90s or maybe early 2000s, everyone was convinced that silicon was almost dead for high-performance chips like CPUs, and that we'd all be switching t

Back in the 90s or maybe early 2000s, everyone was convinced that silicon was almost dead for high-performance chips like CPUs, and that we'd all be switching to GaAs (gallium arsenide) very soon. Turns out that GaAs wasn't that practical and silicon's limitations could be overcome, so we still use silicon today.