As title says, what are some Dungeons or locations/themes/settings that you would have wanted to explore as full blown Raids.
For me it would have to be the missed opportunity of War of the Ancients raid in Cataclysm, where we get to fight alongside the Ancients in the past when the Legion first invaded Azeroth.
My second pick would be Azjol Nerub, because I think that place really deserved to be Suramar levels of scale and epicness as an ancient raid city to explore. The Azjol Nerub and Ahn'kahet dungeons were really just scratching the surface of what could have been.