The only way I'd see it being interesting would be for a rework of AST from WHM's buffier clone to a Regen/Delayed healer based model.
Benefic, Helios, Neutral Sect and Celestial Intersection go out the window, Essential Dignity remains your one burst heal and most of your healing comes from Regens (A. Benefic/Helios, Celestial Opposition) and delays (Earthly Star, Macrocosmos, Exaltation). Collective Unconciousness I'd rather change to where the regen is removed (and the mitigation bubble can stay because I do like you can pop it, mit, and then drop it).
As far as AST problems go:
- Cards are boring. There's six of them, but two effects and people want to go back to the older model where they all do different things.
- APM. This is an easy fix by 1. removing or reworking Trashtrodyne/Seals System, 2. removing the extra charge of draw
To go further in the above, with 2 charges of Draw you're trying to play them both ASAP in the Divination window while also getting the 3 different seals to boost your own DPS. If however, the seals system is removed and a charge of Draw is dropped, you now have 1 card you need to play upon a dps, even if we don't change the current cards' effects.
Aside from that AST shares the other problems healers have: boring 2 dps rotation, too similar to other healers in play style (even from just a healing kit perspective) etc.