As engines, period, will shortly disappear – if the handful of people (there at most a few thousand of them) who constitute "the government" succeed in dictating to the millions of the rest of us the kinds of cars (and powerplants) we'll be allowed to own in the future.
Some of you will have read my recent article about the new (2022) Toyota Tundra, which for the first time will no longer be available with a V8 engine. The other trucks in its class – models like the Chevy Silverado and Ford F-150 – still offer V8s, but are similarly headed in the direction of replacing V8s with much smaller V6s, the prelude to getting rid of engines altogether – in favor of electric motors.
Which few, if any, truck buyers are demanding. Which is interesting.