I am talking about Mt results, not the random ladder matches or the opinions of content creators like Kibler
Mt has nothing to do with real meta-gameplay, and Kibler is not just "random content creator", he's a vteran of card games, lead designer of World of Warcraft Trading Card Game and designer of many other card games.
And again you only look at top 1000 legend. those are approx 1000 players, have you ever done any statistics? 1000 players do not represent the 23.5 million players as of februari 11th. I got the stats from hsreplay obviously, but over all ranks not recluded to several players. Yes Priest is more popular than some classes such as shaman, but you don't nerf something because people like playing it. Also overall popularity of priest doesnt even reach 10% how can a class be labeled as most popular?
Master tour is really not representative for the the game. Blizzard won't nerf a card because a class is seen alot in tournaments. On ladder priest is wayyyyyyyy behind on popularity versus warlock,hunter,paladin and mage.