And what about those servers with 100 people on one of the factions? They can either pay money to transfer or expect to so nothing. Server populations are dying in many cases. Unless they start consolidating servers, it is going to become pretty bad. And if they do that when they release an expansion those consolidated servers become overcrowded.

The entire server concept kind of sucks. If it wasn't necessary to remove lag, it would never have been a good thing. Get unlucky in a choice you have no real data to make and you either re-roll and start new or pay money to fix that choice.

Your arguments really bring me back to early days of the dungeon finder... you know, that tool that killed all guilds, completely destroyed any sense of a realm community, and made people quit the game in droves.

Oh, wait. Guilds use it all the time. Realms are enriched by players who can actually run instances and obtain gear, and afford to buy stuff off the auction house. In fact, I'd say the dungeon finder has given more players an incentive to use the auction house. And please... just imagine the long, drawn out malaise between patch 3.3 in December 2009 and Cataclysm's release in December 2010. Now imagine it without the dungeon finder. At what point would you have cancelled the subscription on your account?

If there's a cross-realm raid finder implemented, it will keep players engaged, give them motivation to contribute, and keep people subscribing. Will there be problems? Yup. Throw 10 or 25 people together in any circumstances and there will be problems ~ even among people who like each other and hang out all the time. There's a reason WoW Insider has a column called "Drama Mamas", and it's not because of the dungeon (or raid) finder.