If enchanters buffs are made raid-wide, the illusionist mythical will need to be reworked, since one of the major abilities is has is to make the haste buff group-wide.
Personally I would like to see enchanters have an emphasis other than dps. It really isn't what the class should be about. But that is all that the developers can see. They seemingly have blinders on, only looking at dps that each class does and balances on that.