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It's final step. ASIC ("application specific integrated circuit") is most effective way of doing things. What you could get in future is just more effective ASICs.
An ASIC is an integrated circuit.
There might be a new type of technology in the future that makes integrated circuits obsolete
For example, right now there are 3DICs, which is a new type of IC, and I don't think most Bitcoin miner ASICs are 3DICs at the moment.
Then in the future there could be a new type of invention that is even more efficient than ICs.
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Ok, it's final step for pure digital electronics.
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