Did they made mistakes in the past? Yes! Did those mistakes doomed they? No.
They had some struggles with their home console business, and two years of financial losses, but their handheld business always made good money and after the Wii / DS huge success they got a lot of money in the bank to try to keep the company afloat even throught hard times, or even if they needed to rethink its purpose as a company.
Lots of changes have been made in the past years, not only the way they treat their consoles business but also the way they treat their intellectual properties. Nobody would have imagined a Nintendo theme park years ago but... it is happening. I expect Nintendo do make use of its properties in different business in the future and expand them in other media rather than only videogames.
