Gee it is amazing how technology solves everything.
It has been discovered that making electrons into small cubes and converting them into magnets solves the problem having wasted space around spherical electrons in a cable and flat electrons (no power left at the end of the cable)
It also dispenses the need of the permanent magnets in the motors. Replacement magnets are fed in as cubical electrons
However, research is still required into the square sectioned cable and the difficulty of moving cubes of electrons, that are magnetically attracted, around a bend in the cable and how to convert the cubical electrons into large permanent magnets.
Word has it that they may solve this problem in 20 or 30 years.
http://www.dumbscience.com
Well I'm holding out for the toroidal electrons, as getting zapped would be a delicious experience. Plus they could just slide down the outside of (round) wires greatly reducing friction.