Not really. Everyone will be playing in the same galaxy. If the system is stabilized ('bug free'), then additional content should be beta tested across platforms simultaneously and released together. What will slow down eventually, is the changes to the core game and play, as this released with a base game and more development promised. I believe that the ultimate goal of the developers is that the game will provide consistent automated changes to the galaxy, with injected content being special cases and galactic changing, all of which occurs server side.