Full white-mage rework -

[Seraphor]

I don't think WHM needs a 'full' rework.
With a few tweaks and additions, you could quite significantly change it up.

For example:

Shell
30s cooldown.
Bestow a 10% damage resistance buff on target for 15s.
Additional effect: Magic damage received by target has a 20% chance of granting you a Lily.

Protect
60s cooldown.
Bestow a 5% damage resistant buff on all party members in range for 30s.
Additional effect: Physical damage received by targets has a 10% chance of granting them a confession stack.

(Shell/Protect would stack with each other)

Lilies are generated only by Medica and Medica II, or by hits received via Shell.
Lilies are only spent when using Cure, Cure II or Cure III.
1 Lily = Cast time of Cure/II/III reduced by 0.5s
2 Lilies = Cast time reduced by 1.5s
3 Lilies = Cast time reduced to 0.

This would give WHM some useful utility in Shell/Protect, and the other healers losing Protect would give WHM some edge over them. They would interact with their Lily mechanic, which in turn would be useful in granting mobility.
Mechanically, it’s not a major shift to the way they function, Lilies are still pretty much passive but with a greater effect, it’s just two additional cooldowns, and WHM doesn’t have enough buttons as it is if you ask me.

[lordcruxis]

I don't think WHM needs a 'full' rework.
With a few tweaks and additions, you could quite significantly change it up.

For example:

Shell
30s cooldown.
Bestow a 10% damage resistance buff on target for 15s.
Additional effect: Magic damage received by target has a 20% chance of granting you a Lily.

Protect
60s cooldown.
Bestow a 5% damage resistant buff on all party members in range for 30s.
Additional effect: Physical damage received by targets has a 10% chance of granting them a confession stack.

(Shell/Protect would stack with each other)

Lilies are generated only by Medica and Medica II, or by hits received via Shell.
Lilies are only spent when using Cure, Cure II or Cure III.
1 Lily = Cast time of Cure/II/III reduced by 0.5s
2 Lilies = Cast time reduced by 1.5s
3 Lilies = Cast time reduced to 0.

This would give WHM some useful utility in Shell/Protect, and the other healers losing Protect would give WHM some edge over them. They would interact with their Lily mechanic, which in turn would be useful in granting mobility.
Mechanically, it’s not a major shift to the way they function, Lilies are still pretty much passive but with a greater effect, it’s just two additional cooldowns, and WHM doesn’t have enough buttons as it is if you ask me.

So, realistically, you're not going to be hit with more that two magic hits within a 15s window, so at best you have around a 36% chance of getting a lily without spamming medica/2. This change doesn't really do anything, they have pretty much a null impact on whm playstyle.

Also, there is essentially never raidwide physical damage, making protect pretty worthless. You made an expanded bole with a side effect that will never proc.

[Orbus]

Also, there is essentially never raidwide physical damage, making protect pretty worthless.

That's probably intentional.
I recall hearing that they don't like protect since it essentially forces them to design all dungeons and bosses around it, and would become an especially bad problem with people raised during the fight since it was physical and they only barely survive with protect, it just turns into a straight up one shot without it, which people just ressed wont.
Don't be surprised if it's removed or completely changed in ShB.