We've already handled that as well. You should be crossing off all such possibilities and be left with only one possible simple answer. It's entirely possible that the implication of it is so grand as to make you not want to face it, but it's the only thing that logically follows from the above- which is to say, practical as it might be, it is immoral to force living beings to kill themselves in order to make room for others, so that's not done. As they would have to die in order to make room for others, but they are not dying, what's the only outcome left?