"Lets say"....??
How do you folks come up with such morbid hypotheticals? And if this is a real life case, then "Allah rehm karay..."
Anyway, altruisitic intentions aside, I don't think the answer is so cut-and-dried. Relationships are complicated, and every person has a right to expect to reproduce and have children. I don't think you'd want to reproduce with an HIV infected person. Suicide is haram in Islam. Once you take out the fluffy, mushy, lovey-dovey stuff, the answer may not be this beautifully gift-wrapped gold box that some of you expect. :)
I agree !