Hmmm. So, if I know anything about how these game series work, the third game will have us traveling through time to visit all of these parts of the world at interesting times throughout their history, becoming a legend even though all we really wanted to do was prevent the evil tentacle from breaking up our parents at the high school battle of the bands, with our trusty floating animal companion that turns into a magical screwdriver.
The export file for that game will, of course, have to be huge to contain every action we took, so we can do it all again in the fourth game with the added challenge of not running into ourselves. By the fifth game, we'll be fighting our way through the series' entire mythology, destroying the revered gods and cementing ourselves as the rulers of the universe. I guess from that point, the only way to proceed would be through prequels.