Balance has performed very well against the opponents he has played against.
Apart from his debut against Australia, this test match and the last one in Windies, he has not "failed" in both innings of a match. Obviously those who do not like him will say he hasn't played against anyone "good" but until you have had a good run again good attacks, you'll never know. And he is still young and improving.
There will be no massive changes to the England team until the new coach is in place and settled.