well it seems the day is going to come.....sometime this summer Blizzard will allow custom character transfers for a small fee.....basiclly that means all OG'ers can transfer to the same server and wreak havoc on others and each other.....they say there will be some restrictions but so far it sounds like a good thing.....
from Blizzard forums
Upcoming Character-Transfer Service
On top of our efforts to evenly disperse our player population through coordinated realm transfers and migrations, we've begun testing our paid character-transfer feature. Scheduled to go live this summer, this feature will allow players to move their characters, within certain restrictions, to a realm of their choosing. This means that player's will now be able to join their friends on other realms without the need to wait for a pre-set mass realm transfer. In addition, this will also contribute to a balancing of the player load from realm to realm, which again is a specific way for us to reduce realm queues and lag. We know that many player's are eager for this service to be implemented, so we'll share further details as soon as more information becomes available.