I don't see any comeback scenario from this. It's just a matter of time how long it will take for it all to fall apart. Their marriage is gone no matter what. Hutch will eventually abandon Vivian (maybe not before getting some kind of revenge on Christian). Hutch has nothing to gain by staying around and keep being lied to. New start is in his best interests.
Their son is a young, studying adult so there is no "stay together for the kid
s" factor. If son gets involved (and it seems he most probably will) he may also abandon Vivian (I don't sense incest vibes in the story).
Once Christian has his fun he will also eventually get bored with Vivian, possibly pimping her for his business. So in the end I think it will be darker story, especially for Vivian.
Whatever path the game will take I'll stick around and enjoy, because Vivan model is GOAT tier (Allison too tbh).
Meanwhile I'm on a new playthrough of Lab Rats 2 with a mission to completely corrupt the mother ... again