The upgrade in the type of RAM qualifies it as a leap sufficient enough. Next gen consoles at 10x defies Moore's Law and is therefore scientifically unsound. The MOST you'll typically get is 6x, from a purely bullshit multiplier perspective.
You have to take in consideration price points when dealing with moores law for a given item. If nintendo followed the moores law route of 2x exponential every 2 years with wii u from gamecube we would be looking at something about 64x the power of gamecube or about 3x the power of xbox 360 for a price equivalent to the gamecube (minus the gamepad) and allowing for inflation. Something tells me the performance will be around that much when the wii u is released if it is indeed $299
If wii released in november 2007 it should have been 8x the power of the gamecube at $249 at break even point. If wii u was to release in november 2013 then it would be 8x
more powerful than the theoretical wii of 2007. Since it is releasing this year something approching 64x the power of the wii is actually very good at a $299 break even price point.
With the durango you will definitely get something 6x the performance of the xbox 360 next year at a break even point at $299 without Kinect or a hdd. If the console is subsidised at a loss of $100 per unit as well as a $100 increase in price you will get an increase in performance as well as all the bells and whistles of an advanved controller like kinect and a 500GB hdd for about $399 at $100 loss per unit and probably 8-9x the power of the xbox 360
But yeah these are all hypotheticals but these are a possible way of MS or sony being able to release a console at close to the 10x jump. If i were microsoft i would not go in that direction and expect profits. Maybe 399 break even at 6x the performance with all the added extras is good enough to compete and allow profits from day one as that is still twice the power of what wii u might be. gamers will be happy to have these choices come xmas 2013.