I get what you are saying. However, what is a wife? She is defined by some function, some role, some human expression, some intention. When those things are absent and yet life is there but is entirely vacant there is no sin on the part of either spouse if divorce should occurs. A man is not a monk. He has some vocation to fulfill as a man, in his work, in his family and home, in his church. When the mate can no longer fulfill, in this case her role, he may have a duty to others and for some reasons to divorce. The wife in this case is not injured by divorce but must be kept tenderly cared for even if he is goes on to another marriage. This wife’s condition imitates death to the sacrament of marriage, as defined by its own duties and conditions, functions and responsibilities. There is no “there” there.
We tend to see things through the lens of the modern American existant culture. Think maybe about the cultures of old.
“In SICKNESS and in HEALTH”
“For as long as you both shall live”
Vows mean something.
I think you are the one who sees things through the lens of modern American culture.
Show me from scripture where God says it is okay to put away a wife because of illness.
In that case, what you have is not a marriage vow given to a person, an identifiable individual human being to whom you pledge your life and loyalty, but rather a contract with a service-provider which can be nullified when the other party can no longer perform.
If that's what you want, fine. But it's not marriage.
If 'marriage' is an employment contract - why not just write it that way? Benefits, sick days, pay... It's one or the other...