Or users eventually get used to it until one day they wake up and realize that the thing they went there for isn't what they get.

I check Facebook less than once a month. I want to see what my distant friends are doing. Instead though I see subversive political memes, and other things (jokes) that are fun once in a while but not worth spending much time on. Because Facebook isn't giving me what I really want I gave up on them. But it took me a while in part because the things I want to see are there - they are just hard to find.