It's not because it's old (or not just because it's old, anyway). There have always been players like that. They'll queue for stuff, but won't want to run it unless they just breeze through. (Even when a brand new patch releases a new dungeon, there will be players that very first day who only want to play it with an experienced team. Of course, nobody is experienced yet at that point, but it doesn't stop them from demanding it.)