Of course it's "limited data," it's only been a week and some change since release. One more reason I roll my eyes at the dogpile.
While I wouldn't throw my toys out of the pram if that happened, I don't think it's particularly realistic either. All Bungie and Activision had was a very limited publishing arrangement for a single game - their relationship is nothing like the one between EA and Bioware, which is essentially whole ownership. Anthem flaming out is unlikely to change that; it's just as if not more likely to mean EA will do what it does to other studios that it has pushed out of their comfort zone, like Westwood, Visceral, Maxis, and Bullfrog.