I'm going to say pass on this. Especially if brought in as another healer. We've already seen what happens to this role when another job is introduced that plays too similarly to WHM. However, I won't go into my issues with healing here.

There just isn't room for GEO. It's not even a job. It's a class like CNJ. Those who practice it do not possess soulstones, as such the knowledge contained within them cannot be passed. Ever wonder why Kyokuho affiliates himself with the AST guild and not the CNJ's? The impression I got from him was that he quite literally was like a regular person (like you or me), and was simply trying out a different discipline; and despite having a natural ability to learn it, ultimately decides, "Nah. Not for me. I'll stick to what I know."

There is also the expectation for new jobs coming with a new expansion. It's getting to the point where we are probably going to have to let that go. I'm not saying it will be 6.0, but if the game continues to release expansions, the devs will eventually make the decision to not bring in any new jobs. Be prepared for that.

I also wouldn't put it past the devs to go against everything, and inexplicably bring the job into the game anyway, as they really like to place all their chips on a single bet and count their chickens before they hatch. But bringing in GEO now would definitely cause a lot of head scratching. If they wanted to bring it in; they would have to change what they've already taught us about it in this game.