I won't call what the dev team did to 5.0 a rework when basicaly has consisted on remove every unique element of his gameplay and sustituted with a WAR element, all being said that don't stop them to give a 180º like they did with BRD in HW-SB so no lose hope. All being said DRK doesn't need a dps buff like other said, the job is competitive number wise and in my opinion Abyssal drain always worked way better as a independent skill that act as a MP dump and i belive it should be like that again, the current desing it's boring and uninteresting and dodn't make it justice considering how fun was the skill before.

The most probable course of action the devs should do is removing or reworking Delirium, the skill has never get so much hate before and no matter where you look everyone literally have a problem with the current desing, even the JP forums has create dedicated threat to change it, so yeah at least Delirium and the whole blackblood system should get a rework from the feet to the head next expansion since it's the biggest behavior on DRK gameplay, and i hope they change other aspects of the job at the same time like increasing the MP generation and make Darkside and Living shadow being more involved mechanics to fix the absurd downtimes the job have.