Since you posted the same comment two times, I will reply to you a second time as well:
"I think people still haven't understood what would happen if Neltharion would merge with Frostwolf. These remaining Nelth players are still playing in this realm because they like Cataclysm, merging it with MoP would do nothing but making these players leave warmane and search for another cata server. Frostwolf would get like what, 5 players in total?"
Also you can't compare a merge between these servers with what happend to Medivh since that was a merge between two TBC realms.
I do agree that at this point Neltharion does actually need a wipe and a new start, no coins refound, no insta 85, no free professions, nothing, just a fresh new start (and yes, I would be very sad to lose all my ferals :c). Unless warmane comes up with a better option I think this is what has to be done.