I think TFU will be the kind of game that you will play 1-2 each years. Kinda like metal gear solid series for me or God of war.
But once you knows the full story and master the fighting system , you start loosing interest for that game . But no worries I'm sure with the success that TFU will archieve , there will be sequels maybe not with the apprentice but other characters.
LA builded that awesome game engine , there big chance for sequels or other SW tittle.
2009-2010 are the years for SW tittles
SW Clones Wars
SW Battlefront 3
SW Kotor mmo
SW TFU sequels