Not this again, power has nothing do it....it's a brand problem...
It's a major part of the problem. The power ensures that the system will never get the major multiplatform games that the PS4 and XB1 will receive. It makes porting a chore, and given the lack of a "hardcore" userbase plus the absence of any online gaming community, there really is little point even porting 360/PS3 ports to the system.
The issue is a mixture of problems that simply make it an inferior product, given how much multiplat titles and online gaming drive sales. These were deliberate tech and strategy decisions by Nintendo, and they backfired.
Today's sales confirm what we already knew: the WiiU is irrelevant to the US market. It's not outright dead, as it is in the European market, but that doesn't provide much comfort. This isn't something a game or two can solve, after all every single game that Nintendo fans argue will save the WiiU came out on the GameCube...and didn't save it.
Nintendo went full throttle on the casual gaming market with the Wii, but they forgot there are two casual gamers. One enjoyed Brain Training, WiiFit, and other party games they could play with family during the holidays; that group has since moved on to smartphones, Kindles, Angry Birds, etc. The other casual gamers live for CoD, Madden, Halo, etc. They love online gaming, they like bragging to friends about their e-exploits. Nintendo has completely ignored that group with two consoles now, and their chickens are coming home to roost.