I can't believe anyone would seriously suggest the name has anything to do with the stock dropping, talk about irrational. I think it had more to do with lack of real games being demonstrated, confusion over whether it is a new console or not (I was even confused during the conference). Bad names are common in gaming, Xbox is stupid, Playstation is lame, Nintendo Entertainment System is generic, Gamecube was ridiculous, Wii was weird. The only company who had some neat names was Sega, and well, that is proof right there that the name of the system means jack.
Wii U is an extension of the Wii brand, a known brand, nothing new. If someone told me in 1998 there would be a console called Xbox I would have thought they were full of crap too, heck if I heard something would be called an iPad I'd think it was a joke. That is just the electronics and gaming industry.