Lets not forget we could change the frequency. Running at 400Hz like aircraft do lets you shrink the capacitors, inductors, and transformers of your power suppl

Lets not forget we could change the frequency. Running at 400Hz like aircraft do lets you shrink the capacitors, inductors, and transformers of your power supplies and your electric motors can make 10 times the power for the same weight. Going to 3-phase instead of single phase probably also helps for power supplies. The power delivered across time is uniform so a sufficiently clever design doesn't need to store energy between cycles. Sure, its another conductor, but they can be slightly smaller so you use the same amount of copper in the end. 50/60Hz is better suited to long distance transmission, but you could put an inverter to 400Hz for the last 50 meters. Smaller, lighter, cheaper devices but with the efficiency loss in the inverter. I suspect it would be a win. (Also, pick a new voltage, something in the ~100v+ range. High enough for efficiency, but then do the lethality tradeoff on picking the ultimate voltage. As long as its a new standard, build ground fault detection at the inverter as part of the standard. There are about 400 household electrocutions per year in the United States, so there is room to improve.)