[senectus1]

so what if its not a grey goo but a grey ecosystem?

Small machines all designed to do small different jobs. then you'd get currents of grey good just supplying power because you have currents of grey goo proving "food" to them because you'd have currents of grey goo disassembling everything around them to provide food and materials to currents of grey goo that make the different sorts of grey goo needed to perform all the previous steps.

I feel that "grey goo" gets used as a descriptor for one thing... when i reality it would be lots of different sorts of things.

having said that, I think we're a loooong way form having to be worried about that as well.