I don't see anything really changing on CO for the foreseeable future, because that will definitely throw off healer balance. It seems every few months someone has to throw out a "WHM has assize why don't we have something similar yada yada". If you want an instant heal so bad just Swiftcast+Helios. White Mage only has Swiftcast and Assize for instant AoE. Yet, Astro has Lightspeed in-addition to Swift. Swiftcast is 60s cooldown, and it's amazing how many subpar healers don't take advantage of this cooldown to their advantage. It's always "we'll someone is going to die every 60s". So be it.

AST now has the most powerful MP refresh skill in the game. AST is clearing every content in the game without any more difficulty than a White Mage, has a World-3rd clear for Midas. There really is no ground to stand that the job is underwhelming anymore.

In the past I suggested buffing the CO buff up to 10 seconds, but with the 3.2 changes now even then that can be seen as powerful because it's such a good DPS buff for balance.