If you own a Gally only play with other Gally owners. That way all the people who wanted the nerf but at the same time always want your help can't get it.
Edit 1: In my experiences most of the people starting groups saying you must have a ghorn are looking for help not elitist. It's people who can't play the game asking for the help of the almighty rocket launcher that have caused the problem so let them do it on their own.
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The point is to make other heavies a little more on par with gally, that way people with out one can join a group and still put out significant damage. Gally will still be the best, but not so OP that it becomes a "have this or get out" type of requirement.