GA has shrunk by about 50% in 20 years in the UK; it is not technology related but financial. The number of licences issued each year give a clue. It is now so expensive to become an instructor that there is virtually no chance of recovering the costs, whilst the experience gained in teaching an ever decreasing number of GA pilots no longer paves the way to airline flying or even becoming a commercial instructor.
With increased costs, bureauracracy, reducing numbers of airfields and many experienced aviators giving up, because they have had enough; GA is heading up the creek without a paddle. Electric aeroplanes can do nothing to save it.