There won't be a new Xbox in 2018, nor a new Playstation.  We just finished up a console generation where the Xbox 360 and PS3 went 8 and 7 years respectively before their successors were released.  Both M$ and Sony have invested billions in the X1 and PS4 and they are both in it for the long haul,  This generation isn't going to go back to the old 5 year cycle just because.  Only Nintendo will be releasing a new console by 2018, and that's because the Wii U will have run completely out of whatever steam it has left by then.

And the 360 in 2013 was "nothing?"  In its 8th year on the market, it moved over 6 million hardware units and over 118 million software units.  That's a heckuvalot more than nothing.  In fact its far more than what the mighty PS2 did in its 8th year in existence.

M$ will not pull the plug early on the X1 like they did with the original Xbox in favor of a jumpstart on Sony.  The X1 will once again have a minimum 7-8 year life cycle, and that should easily carry it past the SNES, probably in less than 5 years on the market as well.

So you cancelled your bet about the XBO beating the PS4 worldwide?

Because if you are expecting tnis to the XBO and think the PS4 will do less than this...