What OP sees as an "ultimatum" is that his wife wanted another child and she was prepared to leave the relationship if he would not agree.
What a lot of people here who are hung up on the word "ultimatum" (OP's word) haven't realized: what OP's wife wants from life is every single bit as important as what OP wants.
OP's wife has only one life to live, and no, she wasn't prepared to sacrifice what she dearly wanted for how OP wanted to live his life or how he thought she should live her life.
She behaved honestly and openly. She didn't pregnant on purpose to trap him. She gave him the choice: either you do this with me or this marriage is not for me.
But like many PPs here, OP didn't/doesn't respect that his wife has her own life, thoughts, feelings, wants, autonomy. He thought the marriage should go the way he wanted, and he has lived for 17 years in a state of peevish rage that she disagreed.
I would say that OP generally does not respect his wife, and might have a low opinion of women in general: he recently sarcastically referred to his wife as the "issuer of well reasoned demands", meaning he sees himself as the logical calm one and she's a hysterical demanding silly bitch. In his eyes, she should have done as he told her, because he knows better.
The only thing OP is a victim of is (a) the patriarchy, and (b) his own passive (passive-aggressive) weak-willed self-pitying character. The patriarchy has told him that in marriage, he is the head of the house and final arbiter of marital decisions, simply because he's male. And because his wife did not agree with this model, OP labels (and implies to us) that his wife's decision to leave was crazy, ridiculous, unreasoned, irresponsible, and he's the victim of this maniac bitch. It's classical patriarchal thinking that allows him to completely ignore his wife's being and bitterly see himself as the victim.
By the way, one really striking thing about the patriarchy is how fucking self-pitying and bitter men are, how they see themselves as victims, how they are unable to see real victims, how they don't see how privileged and advantaged they are as men... and their bitterness is always directed at women, because women didn't/don't do what the guy wants/wanted. It's utterly pathetic and infantile and ludicrous, and over the centuries has caused SO much harm to women and children, and even men themselves.
Going onto point (b), OP has behaved in a deeply infantile way for 17 years, ridiculously seething with resentment at his wife and martyrishly hanging himself on the cross as he slogs away at a job he hates. Over those 17 years, he has had many options: to let his wife leave, not get his wife pregnant, find a better paying job, find a good job that he likes, ask his wife to improve her income earning, express to his wife that he wants a better work/life balance and could they brainstorm how they can make that happen. But he took none of those options.
I know you're a himpathizer @LameBorzoi but OP is not and has never been under coercive control from his wife. It definitely can happen to men but this is NOT the case here. I am sure of this because men (and women) who are under cocercive control don't talk like OP. They present as uncertain, self-doubting, fearful, and very anxious and confused. They have difficulty seeing that they're being controlled, and find the notion hard to accept when they're told it by bystanders. Deep down, they're afraid to accept it because they're scared of their controlling spouse.
OP has none of these markers. He's not being controlled, he just can't accept that his wife refused to be controlled by him. He's absolutely not a victim, and the people here feeling all sorry for him are NOT helping him.
OP should be encouraged to see a therapist so that he can gain honest perspective on that event from 17 years ago, see how he has been the architect of his present misery, and develop self-actualization. If he's lucky, he has another 20-30 years: he should live those without the bitterness and anger that has completely poisoned his life for 17 years already. But for therapy to help, he has to be very honest with himself.
I don't think he's there yet. And you and the other himpathizers aren't helping by pandering to his idiotic sense of victimhood.