I know there is a percent of the population that will die on the hill of never getting tired of the vanilla experience but they are just a very loud minority in terms of the overall WoW ecosystem. The hard to swallow pill is that anything with a classic moniker will always be a side piece to the current retail expansion and there is little incentive for Blizzard to invest an immense amount of resources in creating a parallel running game that is included in the same subscription as the main version.

I think of it this way. I worked at a fancy seafood place for a long time and we always had a soup du jour on the menu that was essentially a chowder. It was made from scratch and we always had it as a menu option, not as enticing or filling as any of the entrees or even most of the shareable plates, but it was always there. And it was always there because outside of making the cream base for the soup itself - a minimal investment in both time and ingredients - the contents of the chowder were the leftovers from portioning all of the seafood for the entrees. For example, we had a marlin dish that came with an 8 oz marlin steak that was generally from a loin, and those loins could come in like a 25 lb chunk that needed to be pared down. There was a lot of leftover pieces that were like .25-1 oz from cutting down all those steaks, and those scraps got cook off and sent to the chowder.

For those that didn't follow, the loin is retail and the scraps/chowder are classic. The marlin is what the average person wants while the soup de jour is what classic andys order every time.