Sparky,
I am for separate Neutral and EGC downstream from the source, SERVICE or SDS.
The main "con" that I see is the fact that for services, the NEC would not have any say over the NESC.
I believe that separate Neutrals and EGC's would help reduce the amount of the electrical degrading of the water piping ( Plumbing ) industry. There should be considerably "less" current flow through such piping systems and 'earth returns' if the Neutral was completely an insulated conductor after the grounding at the source.
The EGC then would only carry minute 'leakage' ( primarily CAPACITANCE ) current from the ungrounded conductors except for "Fault Conditions".
Glenn
