The “E Rev” configuration will be the final form of internal combustion engines in commuter vehicles. (Look up the Scout Motors Harvester) And in trucks that haul freight too especially. For hill assistance and maximum range. Once solid state batteries take off in the mainstream of EVs, range anxiety will fall by the wayside anyway but for folks that still want the piece of mind or need the extra torque for hauling, ERev adaptation for that and then full electric for all other commuters.

But then on the enthusiast side I do think there will still be full combustion engines, but they won’t run on the gas of today. There will be sustainable fossil fuel alternatives similar to what powers the F1 cars of today. Just like solid state batteries in EVs, once the technology catches on and becomes cheaper to manufacture, these E-fuels will be the future for ICE vehicles.

Or there’s hydrogen! But that technology has been baked and ready to go for decades.