On that case, past performance is absolutely not a guide for future results.
The weight/power ratio of electrical motors is so different from combustion engines that it's a qualitative difference already. Just because nobody has ever been able to solve that problem, it doesn't mean that a lot of people won't easily solve it now.
That reminds me of the "V/STOL Wheel of Misfortune", a diagram of 45 different V/STOL designs, of which four made it into service.
https://www.cmlx.co.uk/hawkerassociation/hamain/wheelmisfort...