The Titanic was the largest cruise ship ever built. It was proclaimed to be unsinkable, defying natural laws to those who did not understand how the behemoth could float. In the end, the Titanic sunk not because she was a weak ship but because the ship tried to turn from an iceberg, causing catastrophic hull damage. If the ship had plowed through the iceberg and not changed course, there is a greater chance it could have avoided catastrophe.
While comparing Blizzard to the Titanic doesn't exactly evoke a positive connotation, it should. The Titanic sunk because of mistakes made. Blizzard's conservative game design attitude and philosophy have served it well -- being open to change and modification while holding on to the core concepts of WoW and trying not to deviate in profound, risky ways. The risk sometimes works -- transmogrification, void storage, Raid Finder, Real ID (and soon Battletags), etc. Sometimes, the risk doesn't exactly lead to the best reward -- the Real ID debacle, the vocal hardcore minority and Cataclysm heroics, and the Dance Studio. Blizzard understands that the juggernaut cannot turn too quickly, or it risks the type of deep, jagged incision that sinks the unsinkable.