LNC and DRG can be used on different situations. LNC can easily solo some high level monster with almost no down time, in other hand DRG have only second wind to heal himself making it hard to solo. But if you are on a party you will probably want to be DRG as it have more dmg output. Another situation is ifrit where been a DRG is good for the dmg but using LNC is probably better since you have Sentinel, Stoneskin, Heal and Bloodbath.

The same happens with BLM/THM.

So, no, keep it like it is. Nobody will want to loose more complexity that what we have all ready loose with 1.19 changes.