Sorry but I seriously don't understand, what your're trying to say here?
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If it's anyone's loss, it's your guilds. For causal guilds it doesn't matter, since Normal can be cleared on even shitty alts. In 25 man there's room for a Feral yes but the majority of raiding guilds as of now are 10 man guilds. And any 10 man guild aiming to clear the content on Heroic while it's still current, is cutting themselves short by bringing one.
There's a big difference between being in a Normal mode guild or in a 13/13 Heroic guild and as many people have already said, dps is not the only reason you'd rather want a Rogue or a DK for instance.