Hey there fellow mac user! 
  
I noticed a following problem yesterday, but do not worry, it can be easily fixed. 
  
1. Go to your WoW folder 
2. Right-click WoW app and select "Show package contents" 
3. Go to Contents/MacOS 
4. Launch World of Warcraft executable file 
  
This will open a terminal window and consecutively launch the game  
  
You can easily create an alias for this executable file and place it on your dock for convenient access in the future. 
  
Hopefully this helps you.