I don't compare Facebook with Steemit, because the platforms are fundamentally different - different purposes, different benefits.
But, yes, my time on Facebook has decreased, probably by half - in part due to spending more time on Steemit, but also due to Facebook's new, over-zealous spambot who declares almost every comment I make on a friend's page to be spam! So, yeah... that may just discourage people from using Facebook so much!!!
Will I leave Facebook? Unlikely - because my sons are on there and many of my childhood friends. But my time is increasingly decreased... And yes, it does seem to be the early death throes... problem is there isn't another obvious option. Again, Steemit is fundamentally different and not really meant to be a Facebook substitute.
Thanks for the article.