I didn't say "humanity" will be dead in 200 years. I said every member of "humanity" will be dead in 200 years.
It's this equivocation that "humanity" is "us", when in fact there is no intersection at all between the future humanity that is being discussed, and us, that is the basis for much of what I have said in this thread.
We can aid a "humanity" that does in fact coincide with "us" (that is, now), or we can make equivalent expenditures for a "humanity" that is theoretical, and definitely not "us". That's an important part of the question here that is being obscured by language and the human psychological tendency to implicitly think as if "we" endure beyond our lifespan. I have no issue with the second notion, but only if it's acknowledged, whereas the context of the proposal indicates a belief this is not true. You can have it one way or the other, logically, but not both.