I don't want to take anything away from the hard fought victory that gun advocates won in the Supreme Court last week, but here is why it is not likely to matter much.
I ran across this
article on the Huffington Post today. Here is the problem for gun advocates, most rights are covered by a couple of legal standards, such as "a compelling government interest" and least restrictive means (BTW -- The Supremes did not define a standard). This basically means that the government will likely have to prove in most cases that they have a compelling interest in curtailing your rights and that they are using the least restrictive means for doing it.
Fighting terrorism and securing air travel are pretty compelling government interests. The only chance that 2nd Amendment advocates will likely have is based on least restrictive means. I think ultimately the Supreme Court decision will not cause a huge ripple-affect. I suspect many governments will have to alter their laws and a lot of them will be challenged.
Free speech may hurt people feelings or sensibilities, but rarely (ever?) does speech kill or injure people. It is simple much easier for the government to have a legitimate reason for regulation when it comes to guns. There is also an unknown about where this newly incorporated right will begin and end. Do you have the right to a rocket propelled grenade launcher? An M-16 (fully automatic or semi)? Sawed off shotgun? How about the right to concealed carry? I suspect common sense would dictate that you have the right to own semi-automatic hand guns or rifles (shot guns included). You probably would not have concealed carry rights and you would probably be restricted about where you can carry them (no airports, bars, government buildings, schools, etc). Having said that, I think the government will have to provide reasonable procedures for owning automatic weapons or concealed carry.
Just for the record (as a gun owner), guns don't kill people, but they do make killing people a lot more efficient which is why the government seeks to regulate them. After all nuclear warheads don't kill people either, people in the silos who fire them do, but I digress.
One last note: This decision was clearly not based on strict constructionist principles. Reading the 2nd Amendment clearly defines the right as being related to militias. They had to reach to make this decision.