I didn't hear anything about Fergie, but from the video I didn't think it looked that serious. Then again, I have seen guys get injured that looked like it was nothing and it turned out to be season ending, so who knows.
As for Brady, I'll cut him some slack, it is his first gig so he has some learning to do. I will say this, Witten got a lot of criticism for his short stint announcing and I thought he was better than Brady. But yeah, he doesn't seem to have the voice for TV. I think Fox was hoping to capitalize on Brady's popularity.