But that's exactly what people were saying about fuzzer farms in the mid-2000s, in the belief that artisanal audits would always be the dominant means of uncovering bugs. The truth was somewhere in between (it's still humans, but working at a higher layer of abstraction than they were before) but the fuzzer people were hugely right.

If you can reliably get x% lucky finding vulnerabilities for Y$ cost, then you simply scale that up to find more vulnerabilities.