I personally hate forced diversity. Statistically, there are minorities everywhere, but also statistically there are groups that can form randomly that are all the same ethinicity, minority or not.
Whatever the final roster of the Avengers happens to be, I really hope the community doesn't go into full on nerdrage because there isn't a black character on the team.
Whatever characters are picked, I know they were chosen for the good of the story. In the end that is what it should be about, not some deference to statistics or some misplaced need to make sure minorities (or majorities) are represented.