Will World of Warcraft become freemium?

World of Warcraft was one of the most played MMORPG games back in years. But now, however, the number of players has drastically dropped and Blizzard had made the realms to be cross realm playable.

If you remember the crowdy Orgrimmar , the Auction House, Battlegrounds, nowadays this is not a case. Every fact connected with World of Warcraft is telling us that the game could become freemium ( Free to play, but you will have to pay for some items, skills or incentives ). Also on our opinion, the free play mode until 20 level is just leading us to think like this.  Whats your opinion? Will Blizzard maintain the quality of playing WoW if its free to play?