I don't care if other jobs want to catch up at this point, these are years old problems that should be fixed regardless of if White Mage happens to be a popular job or not. Plus, changes to White Mage generally help any job that even touches the role of White Mage with a 10 yalm pole.
White Mage has plenty to complain about. We have broken barstatus spells that the dev team didn't even listen to us about, we are years overdue for barlight and bardark. Healing Magic skill is about as effective as a brick unless you happen to have no Mind score. Our ability to perform role other then curing is not getting attention - and if we don't get more ability to perform other roles, then other jobs straight up shouldn't be able to cure remotely well at all in exchange. White Mages also have a massive problem with people being able to pick up the job and be as effective at curing people with little work towards gear, skills, or anything other jobs have to do. I could go on.
Personally, I'd prefer a universal change, but I agree that it should be an improvement on top of the current potency effects. Blue Magic is super potent, so it isn't like we don't have room to have more efficient cures for everyone and still be balanced.
First off, Doom and Amnesia removal rates are probably not going to be affected based on SE's past statements, although one can hope.
Again, I don't think that Dark Arts cures should perform any differently then they do now, but I think Light Arts cures should get a buff from having over 80 more points of skill.
Healing Magic skill should improve cures regardless of what job you have, and lets be honest - while this is a more important issue to White Mages whose only role is to dish out the cures and support - other jobs would probably get more benefit from this then White Mages.
If, for example, you cured +X more points of curing per cure, where,
then we would see a much more noticeable increase on lower tier cures then larger tier cures - even if Cure V cured 375 more points per cure, a 225 point boost to Cure III, and a 300 point boost to Cure IV would affect non-White Mage curing much more.X = (Healing Magic Skill -300) * (Tier of Cure)
Keep in mind that this formula is just a basic suggestion that would need tweaking however. Perhaps it would help if someone gave a good suggestion for this, instead of saying that White Mage has no complaints, because a good tweak to how important Healing Magic skill is could help non-White Mage classes out too.