With the new age gamers though, which is the market that matters to businesses, how many will chose the old, outdated version over the new shiny version? That's what you need to look at with this. Current players may enjoy it, but it won't bring in fresh blood and new cash. Call of Duty is a perfect example of this. They're able to constantly release new games because that's what the current generation of consumers want. Us old dogs aren't as important in the eyes of the companies, it's a sad reality, but a reality none the less. Blizzard is a company first and foremost. Their investors care about the money Blizzard makes them. A vanilla server wouldn't make them enough to run. They could put the same effort into making a new expansion for Hearthstone and make multiple 10s of millions from it opposed to the 1 million they'd make off a vanilla server.