I don't think anyone will get bored. It's an ever changing/persistent world. One day you login and the shrikes have a die civic design. The next day they've been slightly altered with no update it anything. That same day you go to a mars mission and realize that the layout is different due to a building that has collapsed from a sand storm early that week. It will always be fresh and new even without the huge dlc expansions. I think it will take a lot fir people to get bored.