You may not, you already had enough.
What people fail to realize, with all the negativity going around, is that there are still people who like WoW, even now, with BfA being what it is. They may not be raiding players, they may not be hardcore players, they may be players that play 2 hours a week, and never even heard of mmo-champion or r/wow, but they are still there, and from what I see in-game, I'd say there are quite a lot of them.
With that in mind, guessing sub numbers, at least for me...is rather difficult, and frankly pointless. So long as there are enough people to play with, I'm good.