So first of all, Obama didn't announce anything. He came up with a list of things he would like to do with guns. Half of them he could have done anyway without a large, showy press conference (for instance writing a few letters). The rest of the things he is waiting on Congress to approve. Most likely, the House will not approve them, which then can turn into a 2014 political ploy in which Republicans didn't pass the "No Longer Shoot Children in the Head Act" or something to that nature.
Besides this hysteria, I would like to point out that gun control is quickly becoming obsolete as an idea to begin with:
http://defensedistributed.com/When the average person can load up their 3D printer with plastic, download a CAD drawing for free off of the internet, and print a gun with minimal assembly, it puts the means of production into the average person. The government wants to outlaw high-capacity mags? Looks like I can print one in my home with no registration that plugs right into my gun. In the very near future, the idea of gun control will be laughable.
Not only that, but it shouldn't be long before a 3D printer may be able to print a new 3D printer. In this situation, even outlawing 3D printers will not prevent the people from gaining the means of production and being able to download designs from the internet for free or for
BTC.
People will always find ways around these rules.