That might turn out to be the case, but we just don't know. Notably, there are some industrial processes that use fossil fuels directly and can't be trivially s

That might turn out to be the case, but we just don't know. Notably, there are some industrial processes that use fossil fuels directly and can't be trivially swapped out for grid power. Those processes might not be possible after a certain point. However, we've had fossil fuels for the entire history of industrial production, so there hasn't been pressure to invent other techniques.