I believe the common use language will be used to overturn bans on semi-auto rifles, and pistols, and standard capacity magazines above ten rounds in which these firearms were designed to use.
The AR-15, and many semi-auto pistols sold with standard 15 round or higher round count magazines are some of the most prevalent and popular firearms in the U.S. I believe the AR is THE most popular rifle in the U.S. When something is that common, how can it not be viewed as common use? Yes, the courts do not have to make sense, especially common sense (pun intended) but I think that is a very cogent argument to make.