You’re wrong.
wpvp is insignificant in wrath, ganking is quite rare whilst levelling, I’ve levelled 4 characters to 80, 3 of them on Ashbringer Alliance (89% Horde)… in the VAST majority of cases opposing faction players simply run by.
At 80, wpvp is a complete and utter non-issue, it is easily avoidable, the world is not dangerous - at all, it is known through out the history of game that flying all but completely killed wpvp, and very much so non-consensual PvP.
Mega servers happen because - reasons, but i will tell you that those reasons are entirely to do with peoples own faction, and absolutely nothing to do with the opposing faction -
i.e people play Gehennas Horde - for Gehennas Horde - NOT for the lack of Gehennas Alliance.