We know that Nintendo had some reasonings behind these decisions. But really they introduced other problems.Not it's not. Your missing the point.
N64: No large, cheap cd's, no. But almost no loading times and an almost undestructable medium.
GC: Small, cheap and powerful. Yes the mini dvd's are a bit silly but at the time online didn't really matter much yet. Xbox was the only one offering decent online anyway because the gimped PS2 online wasn't exactly something to write home about either.
Wii: No HD but than again, nintendo didn't charge 600 euro's for their console either. It was a small, cheap device with a interresting controller.
Now you might not agree with the decisions Nintendo made but you must atleast admit their is some reasonable thought put into it.
Wiiu on the other hand is the exact opposite. It's not cheap, it's not powerful and it doesn't really offer anything new.
Nintendo wanted to bring the older gen conveniences of the cartridge but ignored why others abandoned these conveniences in the next generation of consoles.
Nintendo wanted to bring the older gen conveniences with the GC too and decided to go mini disc to fight piracy but again they ignored why competition continued to abandoned these solutions. And lets face it the PS2 was also small was released earlier, and got the extra slim treatment later on.
The Wii was a GC slapped with a motion controller. It has succeeded only because of that and it was the only good thing they did. If that controller was not there, the Wii would have been a good decorative piece to fill in in store shelf space. Its weaknesses would have been more prevalent discouraging elements of purchase decision.No low price or small dimensions would have saved the console and people would have been discussing in forums today why Nintendo did wrong to introduce an underpowered non-HD product which was basically a GC which people didnt care about anyways a generation ago.
The WiiU is a repetition of the Wii strategy only this time its "strong" feature, the tablet, did not resonate well with the customers. People who had Wii or a PS3 or a 360 see little reason to buy that console because its stuck in time. Just as the previous Nintendo consoles were
The numbers are there. You can see by yourself that Nintendo's reasons (whatever they were) for making their consoles the way they are dont work well with the market. Thats enough proof that they have to change their strategy