"Castronova uses the term 'synthetic world' because a synthetic world 'cannot be sealed completely; people are crossing it all the time in both directions, carrying their behavioral assumptions and attitudes with them.'"If you think of each campaign along with whatever ruleset is being run as a "synthetic world" then players moving from one campaign to another would be similarly carrying over assumptions from one world to another. Sounds pretty obvious, I guess. But it's interesting to me that video games might drive scholarship that can apply equally to our rpgs.
Other thoughts, the flailsnails conventions and the conversion rules in the 1e DMG seem to be the analog of this allowing of movement between circles, but I find it hard to imagine video game companies doing that now. Though it would be cool to head West in Fallout 3 and end up in New Vegas, or to head North (?) in Oblivion and reach Skyrim. Even the old Baldur's Gate games allowed some of this. Is it just console games that allow no transfer from circle to circle? You can't take a Sim from the Sim 2 PC game to Sim 3 can you?
I realize there's a big difference in technologies from one title to another but find it curious that there is no market for sequels that a person could take a character through. Note, no mention of MMORPGs from me because I have zero interest in paying a monthly fee to grind (to be honest, I'm sure my lizard brain I would get wrapped up in it, but my rational brain has so far prevented this from happening).