Naah, the biggest issue is that internal combustion engines are considered dinosaurs, add the money part and there`s no point in that for many manufacturers. Especially in this eco-world, where there are more and more strict pollution standards. From 2020 every engine that produces more CO2 from "some amount", is fined...big problem among many manufacturers as they don`t have that kind of an engine yet, not to mention the scandals active now.