Nintendo isn't poor, but they don't have other departments to back them up like Sony and Microsoft have. Sony is selling all kinds of electronics, and Microsoft is getting money from their software.
Nintendo only have their games and consoles, and when they start to lose money, they don't have other departments of their company that can pump money into them.
I just don't see Sony and MS losing to Nintendo. Money rules, and if Nintendo is going to be last place both in handhelds and consoles, they will inevitable end up like Sega.
Sad.