1.) Slowly start making PvP worse
2.) Watch the steady decline in player numbers
3.) At this point PvP players are a minority
4.) Use 3.) as an excuse for further destroying PvP since it's only a mini game at this point
5.) Lose subs
It's like back in the good ol' days of WoD when they came up with something similar:
1.) Make Ashran a lackluster piece of trash
2.) Lock certain items/faster gear progression behind stupid Trashran RNG boxes
3.) Players are forced to play Ashran in order to stay competetive
4.) Nullify critique by saying that many players play Ashran (because of 2.))
5.) Make PvP gear entirely RNG in the next expansion