There's a risk your friend's life is going to disintegrate and that he'll be boxed in from all sides.
After taxes and alimony, he might not manage much beyond a used $1000 Ford Tempo from thirty years ago, a shoebox, and some cat food and maybe celery. The injustice system can be cruel to men sometimes, particularly working class men.
Meanwhile, her childcare expenses will be paid and then some, she'll have her new boy toy flattering her and supporting her extended family. With the reduction in stress and extra free time, she might get plastic surgery and go to the gym, facilitating another upgrade down the road or just a boytoy on the side.
She might be extremely verbally cruel to her ex-husband should he ever be late with a payment or show up a little late when it's time to trade the kids.
Not every woman is like this obviously, but it's common enough that I'd worry if I were him. I know of three recent divorce cases, one has a villain of an ex-husband (men can be and are often psychotic as well), one is mostly amicable, one has a villain of an ex-wife.
My (male) ex-boss has been undergoing a divorce. The ex-wife is practically insane. She wants the custody sharing to be alternating nights. One night at her house, one night at his house, indefinitely. The judge agreed to this. She's also declining a settlement, she wants the process to be long, which guarantees that it will be expensive. It might cost her, sure, but it will cost him as well. She insults him in front of their kids. She sends him several emails a day telling him how awful he is.