It would be cool, if they change the early Holy tiers to give protection some more reasons not to spec deeper in retribution than the 'mandatory' 5 points for deflection (6, if you use judgement on cooldown in a 9 seconds rotation).
Then we would have the choice between a threat build (retribution+protection) versus a more defensive build (holy+protection).
Tier 1 Holy isn't bad with the option to spec 5/5 Seals of the Pure. Tier 3 looks attractive with Aura Mastery and Impr. LoH. But Tier 2 is plain horrible.
They should add some secondary effect to Divine Intellect (for example, "In Addition, your chance to hit with spells is increased by 1/2/3/4/5%" or "In Addition, your chance to resist spells is increased by 0,5/1/1,5/2/2,5%") and remove the restriction at Healing Light, making it a flat +12% increase for every healing sources (e.g. Seal of Light and Judgement of Light).
Then I would go for somethign like this:
http://ptr.wowhead.com/?talent=sVVzMZE0xA0uMGoIufdx