Honestly I highly doubt the servers will be a smooth launch there's gonna be issues and people are going to complain, but lets be serious no one is going anywhere. Nostalrius crashed and rolled back and got ddos'd and it was pretty rough for awhile but everyone endured through it because they love that nostalgic experience too much. Elysium is gonna be a mess on launch regardless of what happens I imagine the spawn rates of mobs wont be enough to accommodate the amount of people and regardless with that many the first three or so leveling zones are probably gonna lag like crazy no matter what they do. The best thing they can do is release nost and fresh start closely together so the population has more then one choice this will at least make it so not everyone is on the same server.