Overall I'm dissapointed with the decision. I read a good bit of the Majority Opinion and too much of the Dissent.
Anyway, in the majority Opinion, he states that the government can't control ownership of guns in common usage*. However, he then clearly states several times that the government can control the commercial sale of guns. They can't stop people from owning it, but they can stop all future purchases of newly manufactured guns. Prohibition anyone?
*The phrase "Common Usage" will come back to haunt us. It basically means the guns we already have. However, merely looking at how proliferate Machine guns are tells us what they are capable of doing with this term. Machine guns aren't in Common Usage NOT due to personal choice, but due to Government limited purchases and the extreme difficulty in purchasing one, not to mention the artificially inflated cost.
Because of the government laws, Machine Guns are not in common usage, and thus can be legally controlled by the government.
Any paranoid person (like myself) would see that all it would take is a few years, and some very restricted sales to remove a gun from common usage from a region. We would see communities that have very little firearms (by choice) suddenly are legally able to ban all firearms.