I guess now with rake sharing other trains will also end up with LHB. ERS-Patna rakes used for ERS-SMVT (12683) so that train will run with LHB. Similarly TVC-MAQ rakes used for MAQ-LTT Matsyagandha Express so that will also end up with LHB. After this as far as trains with sleeper accommodation is concerned, I think very less trains will remain without LHB. Only the trains from Chennai to Kerala ( MAS-Allp, MAS-MAQ ) and trains like Amrita Express, ERS-Karaikal & maybe few more ( trains from Pune)