New systems won’t be coming out for some time. With the way the new consoles are hooked up to the internet, they can easily update them, which is a lot cheaper than coming out with new hardware. Not to mention, they’ve all added movement based gaming to their repertoire.
A little over a year ago Playstation released the PS3 slim. It’s more affordable than the $600 price tag of the first model PS3s. Also, Xbox released the “new” 360. Today’s consoles aren’t like the ones of the 80’s and 90’s. They’re going to be hanging around quite a bit longer.