World of Warcraft Classic was resisted as the CEO infamously said "You think you want it, but you don't."
When that turned out to be completely wrong and WoW Classic turned out to be a smash success, chances are Blizzard shifted development priority toward more nostalgia.
People are still playing it, but its certainly no longer a smash success. WoW classic really exposed the weakness of easily min maxed old games like vanilla WoW. I hope they learned their lesson and "update" D2. Otherwise yeah it'll be a trip down memory lane and then after the 5th Baal run I'm out.
I fear that would be a cynical but possibly accurate take on it. However I must note I've seen people begging for this ever since D3 released.
I think Blizzard are well aware that there's plenty of us who have grown up with their core franchises, and are now at the age where nostalgia is an easy sell.
(Also interesting to note they have Future, Mobile and Nostalgia releases of the same franchise all on the near-future map. They're not going backwards, but they're certainly spreading out.)
