It will be crystal clear when the enemy line up is mostly consisting of outland alliance while you are in the alliance faction, or i think for u.s. Tichondrius if you are horde and face your own faction.
Such inbalances exist every day, and making factions obsolete will not help it.
Certainly it will not help allliance population, cause there need to be benefits for playing that faction, style and pve isn't one of them, but quick invites are an argument.