You know, there is such a thing as people simply not wanting to leave the city where they're living. Moving a family is a lot different than being a single college student and picking up and moving to the next town. There are things to consider like:
1) Finding a new house
2) Setting up the move into the new house
3) Actually moving into the new house
4) Finding a new school for your children
5) Getting your kids enrolled in said school
6) Finding a new local church, if you attend church
7) Will your kids like the new school? Will they make friends?

Will you and your spouse make new friends?
9) Will your family like the new city?
It's a major pain in the butt. It's a big deal and I can see why people wouldn't want to do it, especially if they're a high-paid executive with tons of experience. Harrison, Kaplan, and Llewelyn may or may not want to leave Nintendo, but if they do you can be assured that they will find another job in a heartbeat (especially in Seattle).
Typically, people will do what is least disruptive to their family, no matter what kind of job they have (as it should be). I'm sure Nintendo would attempt to retain all of these people because it's less disruptive to their business operation to keep them on staff during this transition. If they ever wanted to get rid of them, they could force their resignation (fire them and then announce that they "resigned to pursue other opportunities").