A major challenge for GA has been, and increasingly will be, that while an increasing market size eagerly funds the development of mass production modern economical technology cars, the market for GA planes is already small, and decreasing in size. New development of GA planes is very expensive, particularly for certified airplanes, with costly compliance to government standards. Electric airplanes are very attractive, and actually practical for very irregular (private) use. However, for commercial, or flight training purposes, it's pretty challenging to make money with a new, expensive electric plane, which has to sit charging for hours between revenue flights.
The present airplane certification requirements are not well suited to apply to electric planes. New requirements will come, and are encouraged by the regulators, but still are an investment for a small industry compared to making millions of electric cars.