***My original post only included Mythic Raid Parses, I have made edits to include Normal and Heroic Parses
Looking at 2 weeks of raiding numbers.
Mythic Nerub-ar Palace 774,446 Parses
Herioc Nerub-ar Palace 1,477,918 Parses
Normal Nerub-ar Palace 432,167 Parses
Classic Fresh Molten Core 663,757 Parses
Classic Era Naxxramas 395,180 Parses
Classic Cata Firelands 270,582 Parses
Classic SoD Ahn’Qiraj 116,546 Parses
1,446,065 parses total on Classic versions.
2,684,531 parses on Retail.
***After making corrections, I still believe Classic has a significant player base. There’s a reason 35% of parses are on re-released, old, played out content. Those opinions should not be dismissed.