Charging plugs only need to be a pull out lead with a standard 13 amp plug on the end, just like yr average mobile fone.
Guessing that today's tech will be used is a waste of time.
When my house was being built I very much doubt that the first owner imagined that the grass would be cut with a length of plastic string. Or that he would one day sit in a tin tube for an hour at a height of 30 thousand feet and get out in hot sunshine hundreds of miles away.
What would an American settler in 17canteen have made of a chainsaw?
What would General Custer have done with a Minigun?
We don't know what might even replace the "battery". What if a daylight powered paint coating of some type could also charge the airframe shaped battery? Fly 24/7.
As for the question: technology will handle the idiot proofing, the "pilot" will speak destination or if he has a brain, point to the chart. A set of controls will be fitted but tech will not allow life threatening sits.
You will still be able to fly a Cub, the Continental will be modified to run on hydrogen/oxygen from the fag packet sized splitter and a tank full of swamp water.
How long this will take is down to Government regulators and Business interest.
Flippant mode off.