I tend to be optimistic about these things... I'm convinced Cassano will clean up his act sufficiently if he comes to Juve. A bit like Zlatan, who's kept his fiery qualities, but has so far controlled his temper (bar the ole' headbutt here and there).
An encouraging sign is Cassano's performances at Euro 2004. Well not so much his performances, but the fact that he:
1) Can perform at the highest level and has the right temperament to thrive under pressure.
2) Isn't such a hothead given the right environment. Seems to be the case that Roma's poisonous environment is a significant contributing factor to his behaviour.
I say bring him