Except they have a kid. I doubt she'd casually leave the relationship considering. I may be giving too much credit though.
I don't understand that 'staying together for the children' logic. I can see why parents do it (because they feel that's what is best for the child, to be raised in a two parent home) but kids aren't stupid. They can sense when their parents are miserable and don't like each other. Sometimes being apart and having atleast a semi-amicable relationship with your former partner is what's best. I hope that this is what happens with Wiz & Amber even if she is asking for sole custody. I don't see this getting bitter.