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You're completely missing the point.
>White Shift wouldn't replace healers, in theory it would be on the same level as other healers damage output and healing effectiveness. I don't know why I have to state this but oh well, Did you ignore the whole "black shift gives more spells and potency / White shift gives more healing potency and a lot of the healing spells (required to being a healer), did you assume white shift would do the same amount as damage as current RDM? Because that makes no sense, why would I want RDM to be ahead of healers as a healer?
The concept would need work but it would also possibly effect healer Jobs allowing them to also spec into damage builds or a different sort of healing build.
Current RDM doesn't work as a effective healer in 4 man dugeons, It might work well with a Tank to compliment them such as warrior or pld, but I can't imagine a Red Mage healing a dark knight through a 4 man dugeon without feeling like garbage, it would also ruin any sort of damage output that the red mage has, healers can DPS while healing RDM in it's current state can't, if you think current design has problems where healers don't feel useful enough. I agree, abilites such as Blood whetting in it's current form (only in dugeons) really don't take healers into account, the damage output is a joke, there needs to be changes in general in "casual content" Verraise could also be tweaked in ways that make it so RDM couldn't spam it (as a healer)
Talent trees with support options and stuff, yes a lot of fights might have a "optimal" skill depending on the fight but Ideally all skills would perform well and learning what would work best in a certain encounter would make it fine.
The goal wouldn't be to Replace healer, it would be like adding in a new healer, Of course right now the way healers are designed with very meh rotations, you'd either have to simplify it or give healers something a bit more.
Also this was just a example of how RDM could in theory spec into a healer build or a DPS build, It's not meant to be a in depth, I also don't think it should be something added in current ff14, I personally would love the idea of being able to adapt class skills into fitting more roles in game, Problem is the games so rigid and design is so different you'd have to rework a lot of things from the ground up, which yeah the devs wouldn't do, they've stepped away from even small selectable like role actions, I don't think any of this is even realistic