Flying and Warmode

I think the effect will be minimal because in my experience the primary reason that players do warmode is for the XP buffs, the bribe quests, and the extra abilities. Also, many of the players who do warmode don’t even want flight:

So this idea that flight destroys PvP is not some imaginary non-factor that the OP pulled out of thin air. Whether it’s true or not, some players fanatically believe this, and Blizzard has catered to them for years at our expense.