I\'m not at all familiar with MMO gaming, so I don\'t know if this would be sacrilegious to suggest, but I think you should be able to \"finish\" Planeshift.
Correct me if I\'m wrong, but the goal here is to reach the surface of the world, right? I think this should both be possible in the game, and be a means to finish the game as well. Making an actual playable world on the surface doesn\'t make much of any sense at all if you were to be able to get there.
The thing is, reaching the surface could be the ultimate challenge for players. There would be a massive final dungeon, that could take something like 50-100 hours to actually get through (of course there would be save points). It would contain challenges of all sorts; monsters of legendary power, riddling gate keepers, Myst-like puzzles, labrynthal mazes, complex platform challenges, all the challenges that can possibly exist in the world at their highest difficulty. I think it\'s best such a thing would be instanced as it could be a fairly straightfoward floor based progression (perhaps it\'s a great tower), except the floors would be randomly selected from a master pool, only the number of floors you must pass remains constant.
This is the kind of thing that would require at least 5 or 6 players that are the absolute masters of at least one skill set, and probably two, and of course each of them masters of different skills to tackle the variety of challenges. I\'m assuming here the time to master that much would be a player with 1-2 years experience. Theoretically one person could do this, but they would need to have mastered almost all the skills possible, which would take an insane amount of play time. Lesser parties of maybe 10 or 20 players with 6-12 months experience could potenetially attempt this, but then actually getting everyone together at the same time to attempt something becomes that much more difficult. What I\'m saying is this would have to be a highly organized and focused effort.
The cool part of this all, is that the game would record the actions and chat logs of any party attemping this. Then a team that reaches the surface would have a monument or shrine or something put up at some central area in the world where either a member of the team or one of the game writers would actually make their write their adventure out into a story that everyone could read. If the characters that reached the surface could return to the game world, it\'d have to be in a non-interactive format, they could communicate with people and go places, but couldn\'t directly affect the world.
This all makes sense to me, since all good stories should have an end; no one plays forever, but they could live forever like this. The world here presents what I see as a perfectly logical oppurtunity for implementing this. I don\'t know if I sound crazy for suggesting something like this or am missing some obvious critical flaw here, but it seems really cool to me.