Cdm,
Wow, if you love the person he is in his heart, the husband he has been when providing for his family, the father he is to his children, then the question should never be asked. Flip the persons, and how would the wife feel if the husband had asked that question - devasted I am sure.
There is no guarantee in life, at any moment anyone could be in that same physical shape, or worse. Our time here is temporary and we should cherish every moment of every day.
Now the situation won't be easy, it will be quite difficult, but if you love someone, you work through that no matter what. Look at Christopher Reeve and all the strides his wife went through - thats love.
Have a blessed day,
Sandy