Launching a completely new xbox in 2017 could be a good move, especially if Sony does indeed release a PS4N in 2016. There is no way Sony could counter with a PS5 a year after that. With a more powerfull cpu and additional ram for 4K resolution, it would have a real advantage.
Remember Xbox 360 released 4 years after the first Xbox and it did very well. In fact if Microsoft hade released a successor to the 360 in 2009 Playstation would hade very likely been crushed. Obviously Microsoft made some loses of their own with the 360 at first so a longer generation was in their interests aswell but that's not the case with this generation. There is nothing stopping them from releasing a new Xbox in 2017.







