The "underlying problem" here, for Blizzard, is shareholder value, and they understand it well. The decision to dedicate developer resources to re-releasing old content is driven by careful assessment.

In most cases it's probably driven by falling new player acquisition numbers, and so the equation switches to favoring player retention or luring back veteran players.

Every profile of player has their own preferences (some just want to see big boob textures, etc.) but that doesn't mean they are driving product decisions, except in the case that this demographic becomes core to the business model. But it has nothing to do with the particular preference.