Does that really matter? The always on DRM issue was known long before the game launched. If it was going to have a serious effect on sales of the game, it would have. You can't really argue against "People won't buy it because of DRM" with "Well people aren't playing it anymore!"
I'm sure the number of people who continue to play the game is at the forefront of their thoughts at Activision-Blizzard, not the piles of money they're busy counting.