This chart is being widely linked for good reason. It's worth bearing in mind that some of these names may be the artistic directors who are quoted in Outrageous Fortune (and in articles about the Outrageous Fortune backlash) as saying that American playwrights are a bunch of whiners.
I think Outrageous Fortune is widely misinterpreted. It's not actually a book about plays being messed up by the theatre system. It's a book about money. It's a book about who gets a salary.
By the same token, I've always felt that 13P is a project about money. It's an attempt to show what it looks like when money is used to advance new American plays — by the radical method of actually producing them.