as i said in another post, at this point this will not do anything, new players now will be dozens, not thousands like at launch, so unless we can magically get 4000 people to come to warmane server this faction lock is too late.
what we need is 40% of horde to roll alliance or something similar, and as i have been told previously by mods, they see incentivising as bribing, and do not wish to "bribe" people to be alliance.
the damage to population is done and short of restarting the server with these faction controls in place, then alliance will never be close to horde.
even if they do massive incentives for faction changing, it is not fair to people who went alliance at the very start because they knew this imbalance would happen.