Should time really be devoted to constantly maintaining the proper balance? Even with item level scaling or equalization they still have to account for new mechanics etc. Having it unobtainable is just simply stupid because it wastes all the time they put into it. Why should green fire be something only warlocks during MoP have access to?
The accomplishment you get is like with everything else PvE, you did it sooner and got to enjoy it longer. It is a personal accomplishment the same as old raids becoming solo-able versus always scaling to keep the same difficulty.
You have to examine what is best for the warlock class, and not what is best for your sense of self elitism. Is it better for every warlock to get something considered to be "core" to the warlock class, or for only a few?