Okay... Well. The problem with all of these doom and gloom threads is that people seem to be saying if Nintendo is successful or not by looking at their own personal feelings for each of the individual games and products.
You and your tastes do not speak for the whole, or for the economy. Get over yourself.
By the numbers, 3DS is doing fine, and more than fine in Japan. It needs a strategy to capture people in EU and US, and Pokemon X + Y was a step forward for that.
Wii U is a little underwhelming, because it's not selling like Wii, but it is easily going to outsell the Gamecube. What Nintendo fans should fear right now is that announcement of the nextbox and the ps4, because that could have potentially devastating effects on 3rd party support for Nintendo.
But to change the CEO now is ... way too preemptive. Iwata hasn't really messed up since the launch of the 3DS, and there has been immense recovery from that since.
