I feel like we are 5-10 years from seeing a new ways to manufacture CPU's. Silicon is closely reaching it's practical limit as. Eventually transistors get so small that they experience current leakage. The future looks bright for replacing silicon. There are development in using light photos instead of electrons. Other developments are carbon nano tubes. Yet another development that will likely happen is quantum computing. Still requires more development, but quantum computing could render silicon a non-issue.
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Yup, I would say 5-10 years too. As current silicon transistors are reaching their limits, we definitely need some alternative.