Why did the Stampers want to move on from videogames so bad? Their company was producing some quality titles, they obviously were very skilled at what they did.
Makes sense, but the Stampers stayed on until 2007. I understand needing to stick around for a little bit post-sale to keep things relatively smooth but half a decade and a full console generation seems a bit much.
Either way, the Stampers wanted to sell their share in the company and move on. They took some time to move on, but they wanted to sell to Nintendo. Nintendo said no, find someone else, and when they began looking Nintendo decided to sell their share too rather than negotiate terms constantly with another company. When it was both sides up for grabs it began to get too expensive for EA/Activision, so MS bought them. That was that.