The KotOR fans most likely translate into fans of the story when playing this game, the story in this game is so spread apart by filler questlines that it becomes hard to enjoy the momentum of the story, at least I find it this way.
I really don't see that happening.. I mean yeah I have no doubt it would be a good game but there's no way the game would have as much content as SWTOR. People might take a break to play but unsubscribing to play a game they could finish in a few days?? I doubt it.