A hybrid class cannot respec in top level raiding on a whim. That is a fact. Because Blizzard has destroyed nearly every hybrid spec in the game there is no such thing a hybrid in raiding. A boomkin is dps, nothing else. I have seen exactly 0 progression kills where a prot paladin was brought in to heal, or a boomkin said "zomg the other druid died I better roll lifeblooms." This is a fallacy that "pure" classes get themselves into. Pre-Wrath hybrids were brought because they brought superior buffs to the raid, this has been changed, so they need to do equivalent damage otherwise they would be completely obsolete.