Why ANet cannot keep this up

That's isnt a problem b/c most of us have bought the 3 campaings and for new players in the future Anet should make gold editions. So with or without normal expansion will be the same b/c most of us will buy it. Now for new players; most of the new players buy "NightFall" b/c it is the latest one; and ok thats cool but you will start in other diferent world when in prophecies there are other people starting playing... i think its better to everyone start in the same place. Just adding more new missions and more stuff making tyria biger or do whatever but having everyone starting in the same place of course with new content will rock alot. I dont know if you understand what im trying to say but well.

People like to speculate and worry too much, instead of enjoying the good games as they come. Stop buying when you feel the games are no longer worthy of your money. I don't need a lot of "what if" thought processes, I just play what I like. I stop liking a series, I won't buy the next chapter. Seems simple enough to me. Might ANet be doomed sometime in the future? Possibly. Will there be another good series to play by that time? Probably.

They could keep the same character classes, but introduce Elves and Dwarves as playable races. Maybe some Orcs ...

Wilebill thats been beaten to death already(the corpse is in the basment). No elves or orcs(though for some reason, a friend of mine had a sword of orcslaying O_O). MAYBE dwarves as playable characters, it would fit in alot better than elves or orcs.