What do you expect? Boat Quest: The Perils of the Williamses? 🙂
Just kidding, of course. Everyone moves on to other things in life, and they have their own reasons for doing so. My assumptions are that, if Ken and Roberta were to create a game (and by today’s standards you’d need way more than two people to do that!) and it became successful, people would just demand more and more.
Sometimes you have to pause at making other people’s lives enjoyable and take some time out to enjoy your own. Sierra made my life fun for a solid 15 years, and continues to do so given the few titles I haven’t played through yet. It’s only fair that Ken and Roberta have some fun, too. 🙂
-Tom.