You are forgetting something. Technology advances at an exponential rate not a linear rate. So, the advancements made in the last 100 years, will be made in just a decade or two. And many experts predict that the technological singularity is bound to happen in 2050 or even before that. When that happens, the need for humans will be essentially over as AI would become so intelligent that it could develop itself as a self sustaining "species".
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