The majority of people who choose to be child-free are doing just that - making a choice. Unless you are referring to the extreme minority of people who castrat

The majority of people who choose to be child-free are doing just that - making a choice. Unless you are referring to the extreme minority of people who castrate or kill themselves to avoid conception, you're not actually describing people being "removed" from anything. They're just making choices that don't result in conception. If someone is gay, they are most likely still capable of conceiving with the opposite sex. They are making a series of conscious decisions that preclude that conception, but they haven't been "removed" from the gene pool any more than a straight couple using a condom has been. Unless you don't believe in free will, most people are not at a "dead-end" at all.