IMO, if the husband wants an abortion and the wife does not, he shouldn't have to pay child support. If he wants the child and she aborts it, he should be compensated. But you can't tell someone whether or not they will give birth.
This seems impossible to manage/impose.
Every father ever could declare they wanted an abortion and the mother didn't. Now there are more children being raised without full support of both parents, and fathers have an easy opt-out of their responsibility for creating a child (if you have love with a person you know that there is always a risk of pregnancy, and you are responsible for taking that risk).
When it comes down to it this will always be a case of one persons word against the other. Or should people sign some sort of pre-nup each time they have love formally declaring if they want an abortion for any potential pregnancy that occurs?
And as for people being compensated, how do you possibly do that? How do you put a value on a theoretical life?
You also open it up for men to control the bodies of women through financial coercion.
"Go through 9 months of pregnancy, 1-3 days of intense labour, have your body physically change, become unfit to work or live your normal lifestyle for months, and face the pressures of post-natal depression, OR, you pay me $100,000 in compensation for the life of my unborn child".
And what's to stop a man from threatening a woman this way into giving birth to a child they didn't want, and abandoning the child with the mother?
They could then even claim they wanted an abortion and get out of child support, under your rules.