I definitely think that as time goes on with the development of scripting methods, evolution of crafting, and slow creep further into space, this is a very real possibility. What I imagine happening is the really large groups of people will want to discover new solar systems in order to claim them for their own and develop independently before returning to the original planet and attempting to conquer it. Smaller groups will likely stay in the original solar system/planet and develop in conflict with eachother which could be beneficial or detrimental considering war in RL is a good reason to develop better ways to kill people and it will be easier to grow in numbers untill someone is bored enough or adventurous enough to build stargates to unexplored or occupied systems.
Overall, no matter what happens, the original planet will always be a hot-bed of activity to attract new players and likely develop technologically and socially overtime into a series of small-medium nations.