I think that Christopher's pain and guilt over Adrianna is going to play a very big part in how this all ends. There have been quite a few times already where he has shown how much he misses her and that, while he hasn't said so yet, he blames Tony for what happened (even though he was the one who handed her over). You're right though, of all the characters on the show that are in "the family", Christoper is the one I want to see left standing the most.
Another thought. I never realized how much I liked Adrianna. Maybe her being gone is why I haven't enjoyed this season as much as previous ones. Last night's epidsode was classic though. Looks like a very big war between NJ and NY is about to start.
Phil Leotardo = pure evil
Adrianna was one of the only really likable characters on the show. She was a good person at heart, but was naive. Just like we need a good villian (Ritchie Aprile) we need somebody to like and root for, plus she was hot in that trashy Jersey sort of way.
Adrianna was a tragic character (and they don't get much sexier). But, like all Mafia women, she knew where the goodies that she got came from, but ignored the risks.