Also, along the same lines, do you think people will get bored of WoW: Classic? Do you think servers should progress into the burning crusade and beyond? From the development team AMA:
Q: What are the plans after Phase 6? More content for classic or moving to TBC? 216
A: We’ve done most of the hard work by bringing back 1.12 so progressing to Burning Crusade would be a lot easier for us. Our plan is to identify everything we need to do should we ever decide to go this route. We want to be sensitive to the desires of our players. Some may want BC and some may not. We’ll be following the Classic community closely to help determine what our next steps should be.