So it's widely known as a fact that many Nintendo games have ridiculous legs. But here's the question that no one really bother to ask...why is this so?

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Mummelmann said:
Timeless gameplay that doesn't live off of trends and current gimmicks as a main sales incentive. That's also the reason why Gran Turismo has such great legs and games like Baldur's Gate can be re-released and still do well.

not completely true after the wii and wii U, they popularise the motion gaming gimmick with the wii and they tried to get easy money with the tablet gaming craze with the wii U, but they do have games that don't follow trends with mario and pokemon