I think the transition to electric trainer is a done deal, it is only a matter of how long it is going to take to make the switch. Practical electric GA touring aircraft is a different story as the challenge of getting enough range to be useful, is considerable. However car companies are investing tens of Billions on battery technology so progress is inevitable.
I truly believe GA gasoline engines have no future so significant development of them is pointless. An interesting question is what to do with vintage aircraft. Harry and Megan drove off on their honeymoon in an electric Jaguar E type, is there an electric Chipmunk on the boards ?