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Grace only matters on Brut/patchwerk type fights where it's all about keeping a tank up through a short and nasty tank and spank. Even then it is very susceptible to being outgeared. That is what I think is the most concerning thing about grace, it can be easily outgeared and then the spec seems week.
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If by this you mean to say that reducing damage done to a tank and increasing the healing done to them (perhaps compared with what is given up in holy to achieve this buff) is only necessary on fights that involve very large burst damage potential, then I think you are right, but you have to remember that at each stage of raiding,
when appropriately geared, there is almost always 1 or 2 fights per zone that involve this kind of damage. In this case appropriate means simply "geared to begin progression in the zone."
Prince Malchezaar, Nightbane
Tidewalker, Alar(in some cases, such as a taunt resist)
Halazzi, Nalorakk, Bear Trash, Zul'jin(Lynx Phase)
Azgalor, Archimonde, Gurtogg(Felrage), Mother, Illidan(enrage)
Brutallus, Eredar Twins(I assume there is still a large burst potential in this fight)
Yes, most of these fights become trivial once tanks gear up in the zone (and healers to a lesser extent), but the point remains that these "Burst Limit" situations occurred at every stage of raiding in BC during progression content. Would the Disc priest respec to Holy once farming mode set in? Perhaps, but I do not think that detracts seriously from the talent as it is now. The ability is not trivial. Will it be necessary? I do not know, but I would imagine it will be invaluable for a non-trivial number of encounters during progression. The real question is, can the total Disc Package compete with Paladins for Tank healing, and can it stand on it's own when compared with Holy?
That being said, with the removal of crushing blows, we can expect boss damage to change. In fact, we can expect to see any number of changes to the way raiding works in Wrath. I understand that we can only do our best to evaluate new abilities and talents in light of present experiences, but we should also keep in mind that these talents are not designed for BT/Hyjal or Sunwell, they are designed for an entirely new set of encounters(or touched up, at least in the case of Naxx).
With regard to mana issues, I think these are the biggest concern for PvE disc and I look forward to seeing them tested rigorously. Given Rapture's functionality(only restores mana on effective heals), it seems like Disc will be Cast canceling, with an 8 second window in which they must land a heal. That does make for much tighter use of OOC time, but it does not mean that they will be unable to do so. I personally would like to see Rapture changed to help address the mana concern. If it restored mana based on total healing (including overheal) then that would be a step in the right direction.