Originally Posted by
Biomega
The "exodus" is precipitated by a self-reinforcing vicious circle: there's fewer guilds/groups doing high-end content on Alliance, so people interested in that kind of content go over to Horde; this drains the number of available players interested in doing high-end content on the Alliance side, which as a result means there are fewer guilds/groups on Alliance doing that content; which then means... etc. etc.
They're already trying to make Alliance "more attractive". They gave them an elf race (big draw to a lot of people), Alliance racials are almost universally better in most forms of content, etc. But that doesn't really compensate for the social/community reasons that lie at the heart of the problem, because the marginal gains on racial power do not outweigh the MASSIVE impact of the social/community environment even (or especially) for high-end play. So they'd either need to overbuff things to such a ludicrous degree that it'd be trivial on Alliance vs. hard on Horde (unlikely to happen, and destructive in its own way) or find some other solution people haven't thought about yet.
Or - and this is my own preferred option - they introduce some kind of "reset" button that reshuffles the entire A/H distribution at once. Something like e.g. a Light vs. Void expansion pack where every player now has to basically choose a new faction. Also has the advantage of doing away with racial/races being tied to faction, easing the strain on balance and cosmetics even further because people don't feel "forced" to flock to the new hotness.
But whether or not something of that magnitude will be done, or indeed whether or not Blizzard actually WANTS to do something that radically departs from their AvH identity, is unknown as of yet. Maybe they'll just accept the status quo and sacrifice the enjoyment of Alliance players as the lesser evil, because fixing it would take too much work to cover lost revenue from the few players still remaining on Ally anyway...