BioShock May Spawn Five Sequels

2K Games' Christoph Hartmann has apparently told MCV that BioShock could potentially spawn five sequels, just as the original Star Wars movie did.
(For Bioshock, because it's so story driven, the question obviously arises: how long can you do it without turning into The Matrix? The first Matrix was great, the second one was weird and the third one, you thought: '˜Who [making this] is on crack and who isn't?'. (But, then again, look at Star Wars. It's a fight between good and evil, just like Bioshock. If we spin it the right way and get the right twist of innovation, we can make six parts of it, as Star Wars did.

(But we have to be careful not to cash in. I won't name the company, but there was a great racing game years ago. They brought it back year-on-year. If you look at the scores, it's hard to believe what they've done to it. It's upsetting, actually.)
How about we make one sequel and see how it does without Ken Levine's direction before making plans to develop five more?