The core of Dustin's argument is that Facebook may not have been patient enough; they should have trusted in their beautiful new design and waited long enough for the benefits to bear fruit.
However, it's a cheap argument to make, because the Hard Thing is to decide how many months of crappy numbers are you going to withstand before you admit that your Beautiful New Design in fact isn't any good?
Six months? Two years?
And it's not just revenue you look at. How's overall engagement? Sharing rates? Communication? Discovery?
The article is a shallow snipe; the real issues here are hard, interesting, and unexplored by this piece.