They said it back in MoP? WoD? That people naturally come and go with patch cycles and expansion cycles and that they are perfectly happy with people subbing for patches, finishing what they want and then unsubbing when they are bored and waiting for the next batch of content.
Shareholders--like actual, meaningful ones, not Player Jim who owns a few hundred dollars worth of ATVI--do not care about metrics like "wow subs", they care about the actual movements of the stock, product release windows, the state of large scale areas of profit like how microtransactions are doing etc.
No actual holder cares about people whining over corruptions or monks when ATVI looks like this.