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At least two major problems:
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Semiconductor industry will invest some some $40B in CMOS "plants" and infrastructure
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Currently perhaps $100M a year going into superconducting circuit area!
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How do we "bootstrap" superconducting industry?
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Cannot build memory to match CPU speed and current designs have superconducting CPU's (with perhaps 256 Kbytes superconducting memory per processor) but conventional CMOS memory
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So compared with current computers have a thousand times faster CPU, factor of four smaller cache of CPU speed and same speed basic memory as now
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Can such machines perform well -- need new algorithms?
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Can one design new superconducting memories?
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Superconducting technology also has a bad "name" due to IBM termination!
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