Originally Posted by Deliverance
You appear to be thinking strictly in terms of 25 man raids here, I guess? In terms of 10 man raid progression "bring another warlock" will in most cases not be an option, neither is a DPS warrior nor tank warrior something to be assumed always present. Unless Blizzard makes a hash of the encounters or talents and abilities for WotLK, 10 man raids should work decently even if one or two classes aren't in the raid at all so long as you bring classes capable of covering the relevant basic roles- if the 10 man raids do not, if they require specific classes to be present (or are so much harder without specific classes, that it equates to much the same in the common raider mind), they are likely to be failures for the player population as a whole.
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In order for IW to be useful (other than trash disease buff for DKs to eat), you have to have the following condition
1) No Prot warrior available (either through positioning or just not being present) to Thunder Clap
2) No Prot Paladin available (either through positioning or just not being present) to judge
3) No DK available (either through positioning or just not being present) to Icy Touch
4) 0-1 Warlocks and a raid make up that will not forgo CoE
Thats why it is such an easy talent to toss aside, the chances of #3 and #4 happening are extremely slim. And even then if all those conditions are met, you can still have the option of just sticking a DPS warrior in perma battle stance (or stance dancing which ever doesn't hurt their DPS as much) to use Thunder Clap which will give an even bigger swing reduction anyways.
Also it should be noted that unlike the other slow mechanics, there have been several boss fights (granted they are only 5 man) where they are immune to IW anyways.