Activision has actually said officially that they can't fix the Modern Warfare 2 servers.
So it pretty much means that MW2 is broken for good. Unless they find a way to fix it...
I'm guessing that they can fix it, but they don't wanna spend the money to fix it. Also, Firmware 3.6 is supposedly coming out soon, so anybody with a hacked PS3, you might wanna watch out =0