Relative to the feed going into my house (not just a standard outlet), that doesn't seem too bad. People like to make it sound like electrical distribution is some giant hurdle... I don't see the problem.
What happens when thousands of people all get home from work at around the same time, and then plug in their cars? There's your problem, because most populations aren't going to be wanting brownouts.
The solution to overnight charging is potentially even more trivial: Smart grid-aware chargers (if Nest can do it, so can your car); surge pricing; eliminating individual car ownership in the coming autonomy craze.
People like to make it sound like cultural problems are insurmountable. Sometimes, that may be true. Other times... we just have to suck it up and realize: The future is already here, and it requires change. Personally... I'm excited to get away from a gasoline automotive economy -- at least electricity is agnostic as to the source of EMF.
(In fact, a whole bunch of car batteries hooked to the grid sounds a lot like distributed energy storage required to smooth demand curves...)
