yes, i don't think wii would be nintendo's last console had it failed.
I remember a quote from iwata saying that the day Nintendo stops doing proprietary consoles would be the day nintendo vanished. It was soon after he took the CEO post on an old EGM. The article was the about chances of nintendo being bought by Sony or Microsoft or going third party like sega. People were sure it would happen back then (lol). PS2 was unbeatable and PSP was coming to destroy!