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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This is exactly what will happen! You can't control a group and tell them specifically the only reason for the nerf was cause they are attempting to cull the "Gally only LFG posts".. This will only spur the community to do it more just to spite Bungle! If I still played I'd refuse all the don't have a ghorn. I have over 250+ raid completions thanks to me being a Long time Sherpa but I refuse to be controlled. If I still played there would be no more Sherpa for me at all.. Should have left PVE the hell alone!