If the OP really wants to go to pharmacy school, he can argue this:
1. If both of them have stable jobs, that equals to more job security, especially when they do start a family. Think of it a insurance policy.
2. If something bad should happen to her, who's going to pay the bills. It only gets worse when you have a family, and only one breadwinner. Never rely on one person for the majority of your income.
3. Four years is a drop in a bucket. Tell her its actually 3 years, and you will be back 1 year for rotations.
4. Tell her, you guys aren't getting younger. You are doing this for her, and for your future family.
5. Tell her, that if you become a pharmacist, both of you won't have to work so much so you can raise a family comfortably.
6. Remind her that RN's are in demand everywhere.
7. You can always compromise, that you go to school out of state, and that she look for a cushy job near you on a later date.
Don't u guys wish that relationships were all logic based, and not emotion based...there wouldn't be any grey area.
Too bad thats far from the truth.