I think it is silly to talk about the next generation of consoles at this point. We are all expecting Sony and Microsoft to announce their consoles at this years E3, with a release in Christmas season 2013. Nevertheless, even this is still speculation, for all we know they may not announce it until E3 2014 and release dates could be as far away as 2015. It all depends on exactly how long the two companies want to benefit from the current standing of the console market. Microsoft and Sony are roughly neck and neck when it comes to console sales and since the tech is over 6 years old, manufacturing probably doesn't come at the same cost as it did back in 2004-2006.

The switch to a new console is going to be risky since they now have "casuals" who have bought into their peripherals (which they have been hyping and developing for the last couple of E3's). Who else besides those that really love to play video games are going to justify to themselves to buy another console when they already have a working DVD player/Netflix/Kinect/etc on the one they have now?