It's obvious that you're a big fan Torment hehe, haven't seen many people that have thought about the game as in-depth as you have.
My only two cents to add here is that we should really wait until the game is done to form an opinion. How much do we really know about Bioshock 2? Not much. They've done well to keep details under wrap, and what I would suggest Torment, is that you think about it a little less! You don't want to ruin your B2 experience by over thinking your expectations of the game before ever playing it. Wait for the reviews to come out, read them...THEN make your decision. Until then, I see no reason to believe that B2 won't be as great a game as B1... They've taken their time with it, have a dedicated audience, a dedicated publisher... Biosock has become one of those games that is a part of the flagship group of games for the 360 I think...with others like Mass Effect, Call of Duty, Halo, Gears of War, Assassins Creed...all games and series' that were very well handled, and aren't games that Micosoft will allow to be mediocre, because the 360 gaming community expects so much from them. With the exception of Call of Duty (since it's also on the PS3), when people think of great games for the 360, they think of the ones I listed, along with others. When people read about great games...those above are the games that are discussed. And for that reason, the chance that Bioshock 2 and others will be bad, is, I think, much lower than the chance of them being GREAT.
Wow...so much for my short 2 cent paragraph hehe, my bad. Just have some faith is all I can say