Firstly I don't think you understood the sarcasm of my post. Secondly you're way off if you think wow is a tiny portion of their portfolio. CoD brings in about 3 billion a year total. WoW made 1.92 billion off micro transactions alone. Another billion just for subs. So that ties CoD without ever factoring in all the copies bought for shadowlands, which was the highest selling expac they've had. So no, it will not go into maintenance mode anytime soon.
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While you are correct in your statement about WoW, the list you linked is inaccurate. Tetris isn't even on it, and it has sold the most copies of any game. Not the highest grossing, but it's definitely up there. It should be tied with Halo. So if that's not on the list, I'm sure there are others being left out.