Wii U specs do not matter. Games make people buy consoles/handhelds, not power. Angry Birds sold like gangbusters because it was fun as hell to play. Did it need a high end/next generation device to be created? Nope, just creativity. Same can be said for Wii Sports and many, many other games. Point is, the specs are pointless as software sells hardware. Look at the Vita and all of its power, yet the 3DS, which is completely inferior hardware from a tech stand point, is continually outselling it in every territory. I recall 3DS is doomed forecasts from the soon to be Vita purchasers. I wonder how those folks are holding up these days...?
Anyone who believes that Sony and Microsoft are going to release new consoles and just walk away from the existing sales of the current gen are crazy. Nintendo will have 3rd party ports as long as the PS3 and Xbox 360 continue to be supported, which I suspect is for several more years. 3rd parties are not going to leave all that money on the table either.