why abbiati? I'd take bonnefoi. Otherwise he will leave sooner or later. I think he has a great potential but as a goalkeeper (same as a pitch-player) u need absolutely to get experience. And what would be better to gain experience as a season in serie b? I actually would even dare to say: Sell abbiati (&Buffon), get another (younger, cheaper) goalkeeper, and invest the resulting money in other players.
My Opinion is, that we are not going to B or even C, but actually, if i think of it from a more objective way; it would not be that bad for juventus. (Of course, the juventino in me starts screaming at this moment) but evaluate the facts; some very important core-players will stay (Zambro, DP, Canna, ..) Marchionni will get the chance to play, same goes for bonnefoi (perhaps). Then we will be able to test out people like volpato, etc etc...
In more, I think a relegation could indeed bring some fresh air, even if it is a little bit the radical way. As for the leaving of emerson for example; I know for sure that he is a great player, with a great technique, and some very smart playmaking-aspects BUT he is getting older, and i think he has become quite slow in the last time. Of course, letting him leave will not be good for juve but on the other hand; if, by those means, we will be able to test & find new talented players, then its not that bad after all.