Everyone at FO will tell you they are a serious work in progress if you ever talk to them one on one. They know they are in the nascent stages of developing something. But unless you publish it it'll never get peer reviewed basically. SABR stuff took so long because there was no clearinghouse, just a handful of people writing pamphlets and talking to each other. DYAR is advancing much more rapidly.
My issue is I think the idea is fundamentally flawed. In baseball you can extrapolate individual influence fairly easily because on the vast majority of pitches there is no one on base or the runners on base are stationary. Everyone reacts after the pitch, and at most the only thing that matters is the action of like 5 people depending on where the ball is hit, but mostly it's like three people and one of them is the first basemen who needs to move 5 feet. Easy to examine those plays and with better and better batted ball data, easy to pull useful information.
In football, on literally every singly play the actions of all 22 players matters a MASSIVE deal. And not only what those 22 players do, but how they interact with each other, who they interact with, and how they line up. As far as I am concerned, it's essentially impossible to create The Stat that will explain any individual players worth relative to another player.
