I don't believe this "It will never happen" notion.
I do subscribe to, "We don't know what we don't know".
If someone had suggested 100 years ago that you could cut grass efficiently with a piece of plastic string, they would have been laughed at.
If someone were to tell the gunnery officer on HMS Victory that one day you could put an explosive shell into a target 600 miles away to within a yard, what would he have said?
Battery technology is making leaps and bounds in the motor industry and it won't be too long before power density--weight--size will fit aviation.
Suppose the entire wing of an A380 could be one battery weighing the same, and rechargeable in seconds by a man made bolt of lightning, taking 5/10 hours to discharge at cruise, then what?
Who can say with certainty "it can't be done".
Not today it can't, but-------