It's a hard question to answer because there are so many unknown factors at play that could radically change the outcome. If low-ball estimates about the graphics capability of the Microsoft and Sony consoles prove to be true, then it would be plausible that the console generation could end up being shorter, since Microsoft and Sony would have less need to stick to what they have and make money back on a large investment. However if the systems end up being powerful enough to run things like Unreal Engine 4 and the Luminous Engine at max settings then there would be much less need to upgrade (and much more need to recuperate costs).
You have to wonder where Nintendo will fit into the picture. If 720/Durango and/or Orbis/Omni end up being close enough to the Wii U to justify easy ports, then the Wii U might be in it for the long haul. Part of the reason that Nintendo moved first with the Wii U is because the Wii was too weak for third parties to justify ports from 360/PS3/PC focused games.
Also, you have to consider the effect that mobile and cloud gaming could have on the console market. Mobile devices improve every year, with estimates stating that they'll be able to match a 360's graphics within 1-3 more years. If consoles stay stagnant for too long, then it is a real possibility that mobile devices could catch up to or even surpass consoles, threatening to make them irrelevant. It would be like when the Dreamcast caught up with arcades and took away one of, if not the most important draw of the arcade: that they were better looking than consoles. The only thing really holding mobile back is a lack of a standardized game pad and a lack of a successful, $50-60 game to prove the viability of the market.
As for cloud gaming, we know that Sony has bought Gaikai and rumors have pointed to both Sony and Microsoft planning cloud gaming services for their next-generation platforms. In this context, it may make sense to have moderately powered consoles because once they start to show their age, Microsoft and Sony could just hook up high powered PCs to their service and make the argument that their systems are still graphically relevant(obvious drawbacks of cloud gaming aside). Imagine Microsoft releasing a theroetical X-Box 1080 after the 720, but allowing you to play 1080 games on the 720 over the cloud. Actually they could do the same thing earlier between the 360 and 720.
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