Yes, also assuming that Blizzard is planning to keep the team around after classic WoW is developed. It's not uncommon for companies to hire developers on a contractual basis for specific projects. When it's done, they only re-hire only specific key people permanently to keep it running and let go the rest as they had fulfilled their contract. That may explain why Blizzard is hiring a whole new team of developers for classic wow instead of using existing WoW developers, these new developers may not be intended to be permanent staff.