What changes will push sch out of meta

[Risvertasashi]

Selfish DPS doesn't make a class desirable. It actually has the exact opposite effect - we can see this VERY clearly by looking at MNK. Utiltiy and class synergy are what makes a group work better. "Selfish" classes would have to do so much more DPS to be desired that the meta would shift entirely to stacking them, most likely.

Ah, but WHM could still do bursty heals in between. And it would remove a big incentive for taking SCH instead -- currently SCH DPS is weaker, but self sufficient. Still no fairy, but WHM could spare a few GCDs out of cleric and still do a lot of healing in that brief time.

The only healer that has utility outside of direct healing and mitigation is AST. So both WHM and SCH are 'selfish' (as you use the word) already.

But you are right in that nothing will compare to RR'd balance, and groups already stack ASTs for parser runs.