I agree that the movie will cause problems between them, but I think that if he does hit Chris it'll have a dramatic impact on the rest of the series as far as Tony's fate.

1. I think it would cause his depression to go into overdrive.
2. Carmella would find out and leave him again, this time for good.
3. The cops might link him to the murder. How would it be if the feds finally did get Tony for a murder at the end...Christopher's.