The trouble with that sort of idea though is that you permanently cut off certain content to a section of the community as the game develops - we've already seen this with the changeover from 1.0 and the amount of players complaining about everything that was lost in 1.0 and the constant demands to bring it all back in some form or another probably has dissuaded SE from considering such an idea with ARR.
And having said that, there has been minor changes to the game world as the game progresses (the addition of the friendly beastmen areas, and the gradual development of Revenant's Toll with each content patch, from the dingy glorified camp it was originally at launch through to the booming adventurer's city is it now at the end of 2.55. We'll continue to see things change and develop as the game progresses.
