If a woman is to be submitted to her husband in all things then a vow becomes meaningless. He can just tell her to release him from the vow (assuming he can't just declare it null which I would say he could) and she has to obey. She is to submit as to Christ, what exactly is the limits of how much we're to submit to Christ?
Good point, I don't recall vows being made by Christ, specifically. Our yes should be yes, our no, no. In that regard a vow to a wife is pointless if he has not intentions on being her committed husband. If he says he takes her as his wife then he is responsible for her, no way really around that. So what's it matter if a vow was made or not, Yeshua expects us to honor our word, taking a wife is on its own a vow by obligation, if you will.