What they need to do is add more tanking and healing jobs. Fun ones that would make people WANT to tank and heal. More people tanking and healing means less DDs having to wait around on queue. On top of that, it would be great if XIV could have some content NOT revolving around the "holy trinity". Perhaps content that anybody with anybody battle class can do. Some ideas:

- infiltrating an enemy base and getting from point A to point B. Getting caught means you lose and have to start over. You have to avoid spotlights and being spotted by enemies. Maybe even avoid taking some terrain due to the noise you would make while crossing it. Players can coordinate to hit switches and open pathways for each other.

- Operating a Magitek to destroy an enemy base while of course taking down enemies. Each Magitek can attack, heal, and has defensive abilities.

- Allow people to queue with Chocobos. Need a tank? Use a tanking Chocobo. It can help lessen the queue time.

- Offer more open world content. Bring back open world dungeons! They were a lot of fun and a nice change of pace.

I know SE wants people to stick to their roles in instances, but maybe they can move away from that and offer some unique experiences. A BLM that's tired of using the same old rotation can ride a magitek and feel like a total badass for one instance. It was fu to do it in the story and would be nice to do it again with more mechanics implemented.