LHB coaches needs EOG which further needs good quantity of diesel. Old ICF coaches were running without these large generators. Use of Generators is again coming o diesel consumption on electrified lines. And its not the small amount. Addition to that EOG take place of 2 coaches which makes a 24 coach train to 20 coach train.
So its definitely not the thing that EOG is compulsory. It may be replaced by several different ideas which you can comment below.
EOG can be replaced and should be replaced.
EOG should not be replaced.
Have different view about EOG (kindly comment)