I was a quite active user posting about 1-3 pictures per day, liking stuff and having a bit over hundred followers. I deleted my account after this change. Good riddance Facebook.
How do you know they weren't active? You can log on to look at photos and be counted as a Daily Active User. Just like there are tons of lurkers on Twitter.
What's your point? I have several friends (and myself as well) that deleted their accounts and they were actual active users.