I am going to summarise what I think has happened.
Ops DW had a great job as a travelling nurse which meant she didn't really spend so much time in their house or area, she was flying from one place to another and this really suited her character and personality.
She became pregnant unexpectedly, and op has reassured her if she goes ahead with the pregnancy he will take care of her (not so much that he will not hold her to the pre nup) but enough to keep her in his house.
She has had the baby, it is a total shock to her system. Her wings are now clipped, as she loves the baby too much to leave her but misses her old life terribly.
Her new job - the only one available in the backwater that is their small town is awful and she is very unhappy there.
Having spent so much time in their house, and in the area she now realises how limiting and awful it is - and wants out. I suspect her mother has moved closer to try and support her as much as possible. I think things are much worse than op is suggesting on here. I would imagine she must be feeling quite desperate.
He talks endlessly about numbers and money, she talks about the sheer absence of happiness and fulfilment.
Given the absolutely stupidity of the laws and rules in Indiana that you can't move 20 miles away without the other parent signing their agreement, she is basically trapped in a deadwater. As the op will not agree to allow her to move to a city.
The reason why op is keen to stay - he has the house, the land, the job, the gold plated pension, the savings and investments and now the baby and wife tethered to this terminal life, and he does not want to give an inch of it up - or even compromise. She has nothing.
He is going to try and make her wait for ten years. By that time the child will be eleven, and odds on it is going to be harder to leave then....I am sure op hopes his wife will just get used to it.
I would leave and take my chances if I were her, she is dying slowly in that place anyway. What op is doing is very unethical. He has a solution, he could easily afford a small city house, but he doesn't want to compromise, so he won't. This would be a dealbreaker for most marriages, we are not talking about two years of sticking it out, but ten years she has to endure it for.
It is too long. Way too long to be so unhappy.
If you loved her op, you would run with the city crash pad and make the compromise. The fact you are unwilling to do so tells me your relationship is transactional, just like everything else in your life I suspect.