Electrolytic hydrogen production scales poorly. Cost aside, the additional electricity required to replace methane-derived hydrogen is completely infeasible for the foreseeable future.
Just because we can produce almost any chemistry with electricity does not imply that we have remotely enough spare power generation capacity to make it feasible. Too many proposals for green industrial chemistry implicitly assume that we have several terawatts of green power generation just lying around, which is manifestly not the case nor are we likely to have that kind of extra capacity on any timeframe that matters.
Just because we can produce almost any chemistry with electricity does not imply that we have remotely enough spare power generation capacity to make it feasible. Too many proposals for green industrial chemistry implicitly assume that we have several terawatts of green power generation just lying around, which is manifestly not the case nor are we likely to have that kind of extra capacity on any timeframe that matters.