I think Brock had done what he could do and wasn't going any further, save some scraps with the middle tier of the heavyweight division. But what would have been the appeal?
Both for Brock and for the fans, he's the guy that needs to be at the top or near the top.
I still think if Brock had started MMA training after he got out of college, he would have been an absolute beast and might have reigned or been near the top for a long time.
Oh, so I guess I don't 'miss him', to be fair, he didn't have enough fights for me develop that sort of clingy relationship.