Sometime in the late70s/early 80s we finally reached a point in our technology where a DC system might actually work. The first thing your TV, PC or most "transformerless" power supply electronics is convert the line voltage to 170vdc or so where it is chopped up into 20kz or so and dropped in little torroids to the voltage you need.
The flaw in Edison's system is they did not have the semiconductors to do that.
