it'll be hard to tell. under iwata, they went from their worst console ever to their best, and their best handheld to their worst. within each gen, the ds had a massive turnaround (to the point that people don't even seem to remember how poorly it was doing), and the 3ds was pretty disastrous, but the bleeding there was stopped at least.
for whatever reason, they were unable to do the same with the gamecube. iwata had predicted 50 million gamecubes sold right about the same time when the gc's forecasts were slashed from 6m to 4m, but they never managed to make any headway. of course, back then everything was united under the sony banner and nintendo was seen as staving off yet another newcomer, i guess.
anyway, if they want to turn the wii u around, they'll have to do more than just play the same five games again. they really should make a huge fucking deal out of stuff like bayonetta 2 and xenoblade ii. those are things you won't find anywhere else (well aside from versus, maybe), and might wet the whistle for the gaming fan who is waiting for more substantial games from the new generation.