On a personal level, as someone who gave up playing as a healer after trying out all 3 current healer jobs, I would like dancer to be DPS as it would make it easier for me to try if I ever feel like it. At the same time, I also associate dancer more with being a support DPS than healer anyway.

That said, with the new trust system, I could probably try out dancer (after getting it to 70) even as a healer.

Either way, it doesn't really matter to me. I'm satisfied with SAM so new jobs are only nice as a treat to try out and if they're not for me, then that's fine.